<h2><SPAN name="CHAPTER_IV" id="CHAPTER_IV"></SPAN>CHAPTER IV</h2>
<h3>The Zone of Force Is Tested</h3>
<p>Seaton strode into the control room with a small
oblong box in his hand. Crane was seated at the
desk, poring over an abstruse mathematical treatise
in <i>Science</i>. Margaret was working upon a bit of embroidery.
Dorothy, seated upon a cushion on the floor
with one foot tucked under her, was reading, her hand
straying from time to time to a box of chocolates conveniently
near.</p>
<p>"Well, this is a peaceful, home-like scene—too bad to
bust it up. Just finished sealing off and flashing out this
case, Mart. Going to see if she'll read. Want to take a
look?"</p>
<p>He placed the compass upon the plane table, so that its
final bearing could be read upon the master circles controlled
by the gyroscopes; then simultaneously started
his stop-watch and pressed the button which caused a
minute couple to be applied to the needle. Instantly the
needle began to revolve, and for many minutes there was
no apparent change in its motion in either the primary or
secondary bearings.</p>
<p>"Do you suppose it is out of order, after all?" asked
Crane, regretfully.<span class='pagenum'><SPAN name="Page_400" id="Page_400"></SPAN></span></p>
<p>"I don't think so," Seaton pondered. "You see, they
weren't designed to indicate such distances on such small
objects as men, so I threw a million ohms in series with
the impulse. That cuts down the free rotation to less
than half an hour, and increases the sensitivity to the
limit. There, isn't she trying to quit it?"</p>
<p>"Yes, it is settling down. It must be on him still."
Finally the ultra-sensitive needle came to rest. When
it had done so, Seaton calculated the distance, read the
direction, and made a reading upon Osnome.</p>
<p>"He's there, all right. Bearings agree, and distances
check to within a light-year, which is as close as we can
hope to check on as small a mass as a man. Well, that's
that—nothing to do about it until after we get there.
One sure thing, Mart—we're not coming straight back
home from 'X'."</p>
<p>"No, an investigation is indicated."</p>
<p>"Well, that puts me out of a job. What to do? Don't
want to study, like you. Can't crochet, like Peg. Darned
if I'll sit cross-legged on a pillow and eat candy, like
that Titian blonde over there on the floor. I know
what—I'll build me a mechanical educator and teach Shiro to
talk English instead of that mess of language he indulges
in. How'd that be, Mart?"</p>
<p>"Don't do it," put in Dorothy, positively. "He's just
too perfect the way he is. Especially don't do it if he'd
talk the way you do—or could you teach him to talk the
way you write?"</p>
<p>"Ouch! That's a dirty dig. However, Mrs. Seaton,
I am able and willing to defend my customary mode of
speech. You realize that the spoken word is ephemeral,
whereas the thought, whose nuances have once been expressed
in imperishable print is not subject to revision—its
crudities can never be remodeled into more subtle,
more gracious shading. It is my contention that, due to
these inescapable conditions, the mental effort necessitated
by the employment of nice distinctions in sense and
meaning of words and a slavish adherence to the dictates
of the more precise grammarians should be reserved for
the print...."</p>
<p>He broke off as Dorothy, in one lithe motion, rose and
hurled her pillow at his head.</p>
<p>"Choke him, somebody! Perhaps you had better build
it, Dick, after all."</p>
<p>"I believe that he would like it, Dick. He is trying
hard to learn, and the continuous use of a dictionary is
undoubtedly a nuisance to him."</p>
<p>"I'll ask him. Shiro!"</p>
<p>"You have call, sir?" Shiro entered the room from his
galley, with his unfailing bow.</p>
<p>"Yes. How'd you like to learn to talk English like
Crane there does—without taking lessons?"</p>
<p>Shiro smiled doubtfully, unable to take such a thought
seriously.</p>
<p>"Yes, it can be done," Crane assured him. "Doctor
Seaton can build a machine which will teach you all at
once, if you like."</p>
<p>"I like, sir, enormously, yes, sir. I years study and
pore, but honorable English extraordinary difference
from Nipponese—no can do. Dictionary useful
but ..." he flipped pages dexterously, "extremely
cumbrous. If honorable Seaton can do, shall be extreme ...
gratification."</p>
<p>He bowed again, smiled, and went out.</p>
<p>"I'll do just that little thing. So long, folks, I'm going
up to the shop."</p>
<hr style='width: 45%;' />
<p>Day after day the <i>Skylark</i> plunged through the vast
emptiness of the interstellar reaches. At the end
of each second she was traveling exactly twenty-six feet
per second faster than she had been at its beginning; and
as day after day passed, her velocity mounted into figures
which became meaningless, even when expressed in
thousands of miles per second. Still she seemed stationary
to her occupants, and only different from a vessel
motionless upon the surface of the Earth in that objects
within her hull had lost three-sixteenths of their normal
weight. Acceleration, too, had its effect. Only the
rapidity with which the closer suns and their planets were
passed gave any indication of the frightful speed at
which they were being hurtled along by the inconceivable
power of that disintegrating copper bar.</p>
<p>When the vessel was nearly half-way to "X," the bar
was reversed in order to change the sign of their acceleration,
and the hollow sphere spun through an angle of one
hundred and eighty degrees around the motionless cage
which housed the enormous gyroscopes. Still apparently
motionless and exactly as she had been before, the <i>Skylark</i>
was now actually traveling in a direction which
seemed "down" and with a velocity which was being constantly
decreased by the amount of their negative acceleration.</p>
<p>A few days after the bar had been reversed Seaton
announced that the mechanical educator was complete,
and brought it into the control room.</p>
<p>In appearance it was not unlike a large radio set, but
it was infinitely more complex. It possessed numerous
tubes, kino-lamps, and photo-electric cells, as well as
many coils of peculiar design—there were dozens of
dials and knobs, and a multiple set of head-harnesses.</p>
<p>"How can a thing like that possibly work as it does?"
asked Crane. "I know that it does work, but I could
scarcely believe it, even after it had educated me."</p>
<p>"That is nothing like the one Dunark used, Dick," objected
Dorothy. "How come?"</p>
<p>"I'll answer you first, Dot. This is an improved
model—it has quite a few gadgets of my own in it. Now,
Mart, as to how it works—it isn't so funny after you
understand it—it's a lot like radio in that respect. It
operates on a band of frequencies lying between the
longest light and heat waves and the shortest radio
waves. This thing here is the generator of those waves
and a very heavy power amplifier. The headsets are
stereoscopic transmitters, taking or receiving a three-dimensional
view. Nearly all matter is transparent to
those waves; for instance bones, hair, and so on. However,
cerebin, a cerebroside peculiar to the thinking structure
of the brain, is opaque to them. Dunark, not knowing
chemistry, didn't know why the educator worked or
what it worked on—he found out by experiment that it
did work; just as we found out about electricity. This
three-dimensional model, or view, or whatever you want
to call it, is converted into electricity in the headsets, and
the resulting modulated wave goes back to the educator.
There it is heterodyned with another wave—this second
frequency was found after thousands of trials and is, I
believe, the exact frequency existing in the optic nerves
themselves—and sent to the receiving headset. Modulated
as it is, and producing a three-dimensional picture,
after rectification in the receiver, it reproduces exactly
what has been 'viewed,' if due allowance has been made
for the size and configuration of the different brains involved
in the transfer. You remember a sort of flash—a<span class='pagenum'><SPAN name="Page_401" id="Page_401"></SPAN></span>
sensation of seeing something—when the educator
worked on you? Well, you did see it, just as though it
had been transmitted to the brain by the optic nerve, but
everything came at once, so the impression of sight was
confused. The result in the brain, however, was clear
and permanent. The only drawback is that you haven't
the visual memory of what you have learned, and that
sometimes makes it hard to use your knowledge. You
don't know whether you know anything about a certain
subject or not until after you go digging around in your
brain looking for it."</p>
<div class="figright"> <ANTIMG src="images/ill-388.png" width-obs="390" height-obs="600" alt="Seaton learns Nipponese; Shiro English." title="Seaton learns Nipponese; Shiro English." />
<span class="caption">"All set," he reported crisply, and barked
a series of explosive syllables at Shiro,
ending upon a rising note.</span></div>
<p>"I see," said Crane, and Dorothy, the irrepressible,
put in:</p>
<p>"Just as clear as so much mud. What are the improvements
you added to the original design?"</p>
<p>"Well, you see, I had a big advantage in knowing that
cerebrin was the substance involved, and with that
knowledge I could carry matters considerably farther
than Dunark could in his original model. I can transfer
the thoughts of somebody else to a third party or to a
record. Dunark's machine couldn't work against resistance—if
the subject wasn't willing to give up his thoughts
he couldn't get them. This one can take them away by
force. In fact, by increasing plate and grid voltages in
the amplifier, I can pretty nearly burn out a man's brain.
Yesterday, I was playing with it, transferring a section of
my own brain to a magnetized tape—for a permanent
record, you know—and found out that above certain
rather low voltages it becomes a form of torture that
would make the best efforts of the old Inquisition seem
like a petting party."</p>
<p>"Did you succeed in the transfer?" Crane was intensely
interested.</p>
<p>"Sure. Push the button for Shiro, and we'll start
something."</p>
<p>"Put your <ins class="corr" title="Transcriber's Note: Original reads 'heads'">head</ins> against this screen," he directed when
Shiro had come in, smiling and bowing as usual. "I've
got to caliper your brains to do a good job."</p>
<p>The calipering done, he adjusted various dials and
clamped the electrodes over his own head and over the
heads of Crane and Shiro.</p>
<p>"Want to learn Japanese while we're at it, Mart?
I'm going to."</p>
<p>"Yes, please. I tried to learn it while I was in Japan,
but it was altogether too difficult to be worth while."</p>
<p>Seaton threw in a switch, opened it, depressed two
more, opened them, and threw off the power.</p>
<p>"All set," he reported crisply, and barked a series of
explosive syllables at Shiro, ending upon a rising note.</p>
<p>"Yes, sir," answered the Japanese. "You speak Nipponese
as though you had never spoken any other tongue.
I am very grateful to you, sir, that I may now discard
my dictionary."</p>
<p>"How about you two girls—anything you want to learn
in a hurry?"</p>
<p>"Not me!" declared Dorothy emphatically. "That machine
is too darn weird to suit me. Besides, if I knew as
much about science as you do, we'd probably fight about
it."</p>
<p>"I do not believe I care to...." began Margaret.</p>
<p>She was interrupted by the penetrating sound of an
alarm bell.</p>
<p>"That's a new note!" exclaimed Seaton, "I never
heard that note before."</p>
<p>He stood in surprise at the board, where a brilliant
purple light was flashing slowly. "Great Cat! That's a
purely Osnomian war-gadget—kind of a battleship detector—shows
that there's a boatload of bad news around
here somewhere. Grab the visiplates quick, folks," as he
rang Shiro's bell. "I'll take visiplate area one, dead
ahead. Mart, take number two. Dot, three; Peg, four;
Shiro, five. Look sharp!... Nothing in front. See
anything, any of you?"</p>
<hr style='width: 45%;' />
<p>None of them could discover anything amiss, but
the purple light continued to flash, and the bell to
ring. Seaton cut off the bell.</p>
<p>"We're almost to 'X'," he thought aloud. "Can't be
more than a million miles or so, and we're almost stopped.
Wonder if somebody's there ahead of us? Maybe Dunark
is doing this, though. I'll call him and see." He
threw in a switch and said one word—"Dunark!"</p>
<p>"Here!" came the voice of the Kofedix from the
speaker. "Are you generating?"</p>
<p>"No—just called to see if you were. What do you
make of it?"</p>
<p>"Nothing as yet. Better close up?"</p>
<p>"Yes, edge over this way and I'll come over to meet
you. Leave your negative as it is—we'll be stopped directly.
Whatever it is, it's dead ahead. It's a long ways
off yet, but we'd better get organized. Wouldn't talk
much, either—they may intercept our wave, narrow as it
is."</p>
<p>"Better yet, shut off your radio entirely. When we
get close enough together, we'll use the hand-language.
You may not know that you know it, but you do. Turn
your heaviest searchlight toward me—I'll do the same."</p>
<p>There was a click as Dunark's power was shut off
abruptly, and Seaton grinned as he cut his own.</p>
<p>"That's right, too, folks. In Osnomian battles we always
used a sign-language when we couldn't hear anything—and
that was most of the time. I know it as well
as I know English, now that I am reminded of the fact."</p>
<p>He shifted his course to intercept that of the Osnomian
vessel. After a time the watchers picked out a minute
point of light, moving comparatively rapidly against the
stars, and knew it to be the searchlight of the <i>Kondal</i>.
Soon the two vessels were almost side by side, moving
cautiously forward, and Seaton set up a sixty-inch parabolic
reflector, focused upon a coil. As they went on,
the purple light continued to flash more and more rapidly,
but still nothing was to be seen.</p>
<p>"Take number six visiplate, will you, Mart? It's
telescopic, equivalent to a twenty-inch refractor. I'll tell
you where to look in a minute—this reflector increases
the power of the regular indicator." He studied meters
and adjusted dials. "Set on nineteen hours forty-three
minutes, and two hundred seventy-one degrees. He's
too far away yet to read exactly, but that'll put him in
the field of vision."</p>
<p>"Is this radiation harmful?" asked Margaret.</p>
<p>"Not yet—it's too weak. Pretty soon we may be able
to feel it; then I'll throw out a screen against it. When
it's strong enough, it's pretty deadly stuff. See anything,
Mart?"</p>
<p>"I see something, but it is very indistinct. It is moving
in sharper now. Yes, it is a space-ship, shaped like a
dirigible airship."</p>
<p>"See it yet, Dunark?" Seaton signaled.</p>
<p>"Just sighted it. Ready to attack?"</p>
<p>"I am not. I'm going to run. Let's go, and go fast!"</p>
<p>Dunark signaled violently, and Seaton shook his head
time after time, stubbornly.<span class='pagenum'><SPAN name="Page_402" id="Page_402"></SPAN></span></p>
<p>"A difficulty?" asked Crane.</p>
<p>"Yes. He wants to go jump on it, but I'm not looking
for trouble with any such craft as that—it must be a
thousand feet long and is certainly neither Terrestrial
nor Osnomian. I say beat it while we're all in one piece.
How about it?"</p>
<p>"Absolutely," concurred Crane and both women.</p>
<p>The bar was reversed and the <i>Skylark</i> leaped away.
The <i>Kondal</i> followed, although the observers could see
that Dunark was raging. Seaton swung number six visiplate
around, looked once, and switched on the radio.</p>
<p>"Well, Dunark," he said grimly. "You get your wish.
That bird is coming out, with at least twice the acceleration
we could get with both motors full on. He saw us
all the time, and was waiting for us."</p>
<p>"Go on—get away if you can. You can stand a higher
acceleration than we can. We'll hold him as long as
possible."</p>
<p>"I would, if it would do any good, but it won't. He's
so much faster than we are that he could catch us anyway,
if he wanted to, no matter how much of a start we
had—and it looks now as though he wanted us. Two of
us stand a lot better chance than one of licking him if
he's looking for trouble. Spread out a mile or two, and
pretend this is all the speed we've got. What'll we give
him first?"</p>
<p>"Give him everything at once. Rays six, seven, eight,
nine, and ten...." Crane, with Seaton, began making
contacts, rapidly but with precision. "Heat wave two-seven.
Induction, five-eight. Oscillation, everything
under point oh six three. All the explosive copper we
can get in. Right?"</p>
<p>"Right—and if worse comes to worst, remember the
zone of force. Let him shoot first, because he may be
peaceable—but it doesn't look like olive branches to me."</p>
<p>"Got both your screens out?"</p>
<p>"Yes. Mart, you might take number two visiplate and
work the guns—I'll handle the rest of this stuff. Better
strap yourselves in solid, folks—this may develop into a
kind of rough party, by the looks of things right now."</p>
<hr style='width: 45%;' />
<p>As he spoke, a pyrotechnic display enveloped the entire
ship as a radiation from the foreign vessel
struck the other neutralizing screen and dissipated its
force harmlessly in the ether. Instantly Seaton threw on
the full power of his refrigerating system and shot in
the master switch that actuated the complex offensive
armament of his dreadnought of the skies. An intense,
livid violet glow hid completely main and auxiliary power
bars, and long flashes leaped between metallic objects in
all parts of the vessel. The passengers felt each hair
striving to stand on end as the very air became more and
more highly charged—and this was but the slight corona-loss
of the frightful stream of destruction being hurled at
the other space-cruiser, now scarcely a mile away!</p>
<p>Seaton stared into number one visiplate, manipulating
levers and dials as he drove the <i>Skylark</i> hither and yon,
dodging frantically, the while the automatic focusing devices
remained centered upon the enemy and the enormous
generators continued to pour forth their deadly
frequencies. The bars glowed more fiercely as they were
advanced to full working load—the stranger was one
blaze of incandescent ionization, but she still fought on;
and Seaton noticed that the pyrometers recording the
temperature of the shell were mounting rapidly, in
spite of the refrigerators.</p>
<p>"Dunark, put everything you've got upon one spot—right
on the end of his nose!"</p>
<p>As the first shell struck the mark, Seaton concentrated
every force at his command upon the designated point.
The air in the <i>Skylark</i> crackled and hissed and intense
violet flames leaped from the bars as they were driven
almost to the point of disruption. From the forward end
of the strange craft there erupted prominence after
prominence of searing, unbearable flame as the terrific
charges of explosive copper struck the mark and exploded,
liberating instantaneously their millions upon millions
of kilowatt-hours of intra-atomic energy. Each
prominence enveloped all three of the fighting vessels
and extended for hundreds of miles out into space—but
still the enemy warship continued to hurl forth solid and
vibratory destruction.</p>
<p>A brilliant orange light flared upon the panel, and
Seaton gasped as he swung his visiplate upon his defenses,
which he had supposed impregnable. His outer
screen was already down, although its mighty copper
generator was exerting its utmost power. Black areas
had already appeared and were spreading rapidly, where
there should have been only incandescent radiance; and
the inner screen was even now radiating far into the
ultra-violet and was certainly doomed. Knowing as he
did the stupendous power driving those screens, he knew
that there were superhuman and inconceivable forces being
directed against them, and his right hand flashed to
the switch controlling the zone of force. Fast as he was,
much happened in the mere moment that passed before
his flying hand could close the switch. In the last infinitesimal
instant of time before the zone closed in, a
gaping black hole appeared in the incandescence of the
inner screen, and a small portion of a ray of energy so
stupendous as to be palpable, struck, like a tangible
projectile, the exposed flank of the <i>Skylark</i>. Instantly
the refractory arenak turned an intense, dazzling white
and more than a foot of the forty-eight-inch skin of the
vessel melted away, like snow before an oxy-acetylene
flame: melting and flying away in molten globes and
sparkling gases—the refrigerating coils lining the hull
were of no avail against the concentrated energy of that
titanic thrust. As Seaton shut off his power, intense
darkness and utter silence closed in, and he snapped on
the lights.</p>
<p>"They take one trick!" he blazed, his eyes almost
emitting sparks, and leaped for the generators. He had
forgotten the efforts of the zone of force, however, and
only sprawled grotesquely in the air until he floated
within reach of a line.</p>
<p>"Hold everything, Dick!" Crane snapped, as Seaton
bent over one of the bars. "What are you going to do?"</p>
<p>"I'm going to put as heavy bars in these ray-generators
as they'll stand and go out and get that bird. We
can't lick him with Osnomian rays or with our explosive
copper, but I can carve that sausage into slices with a
zone of force, and I'm going to do it."</p>
<p>"Steady, old man—take it easy. I see your point,
but remember that you must release the zone of force before
you can use it as a weapon. Furthermore, you must
discover his exact location, and must get close enough to
him to use the zone as a weapon, all without its protection.
Can those ray-screens be made sufficiently powerful
to withstand the beam they employed last, even for a
second?"</p>
<p>"Hm ... m ... m. Never thought of that, Mart,"<span class='pagenum'><SPAN name="Page_403" id="Page_403"></SPAN></span>
Seaton replied, the fire dying out of his eyes. "Wonder
how long the battle lasted?"</p>
<p>"Eight and two-tenths seconds, from first to last, but
they had had that heavy ray in action only a fraction of
one second when you cut in the zone of force. Either
they underestimated our strength at first, or else it required
about eight seconds to tune in their heavy generators—probably
the former."</p>
<p>"But we've <i>got</i> to do something, man! We can't just
sit here and twiddle our thumbs!"</p>
<p>"Why, and why not? That course seems eminently
wise and proper. In fact, at the present time, thumb-twiddling
is distinctly indicated."</p>
<p>"Oh, you're full of little red ants! We can't do a
thing with that zone on—and you say just sit here. Suppose
they know all about that zone of force? Suppose
they can crack it? Suppose they ram us?"</p>
<p>"I shall take up your objections in order," Crane had
lighted a cigarette and was smoking meditatively. "First,
they may or may not know about it. At present, that
point is immaterial. Second, whether or not they know
about it, it is almost a certainty that they cannot crack
it. It had been up for more than three minutes, and
they have undoubtedly concentrated everything possible
upon us during that time. It is still standing. I really
expected it to go down in the first few seconds, but now
that it has held this long it will, in all probability, continue
to hold indefinitely. Third, they most certainly will not
ram us, for several reasons. They probably have encountered
few, if any, foreign vessels able to stand
against them for a minute, and will act accordingly.
Then, too, it is probably safe to assume that their vessel
is damaged, to some slight extent at least; for I do not
believe that any possible armament could withstand the
forces you directed against them and escape entirely unscathed.
Finally, if they did ram us, what would happen?
Would we feel the shock? That barrier in the
ether seems impervious, and if so, it could not transmit
a blow. I do not see exactly how it would affect the
ship dealing the blow. You are the one who works out
the new problems in unexplored mathematics—some time
you must take a few months off and work it out."</p>
<p>"Yes, it would take that long, too, I guess—but you're
right, he can't hurt us. That's using the old bean, Mart!
I was going off half-cocked again, darn it! I'll pipe
down, and we'll go into a huddle."</p>
<hr style='width: 45%;' />
<p>Seaton noticed that Dorothy's face was white and
that she was fighting for self-control. Drawing himself
over to her, he picked her up in a tight embrace.</p>
<p>"Cheer up, Red-Top! This man's war ain't started
yet!"</p>
<p>"Not started? What do you mean? Haven't you and
Martin just been admitting to each other that you can't
do anything? Doesn't that mean that we are beaten?"</p>
<p>"Beaten! Us? How do you get that way? Not on
your sweet young life!" he ejaculated, and the surprise
on his face was so manifest that she recovered instantly.
"We've just dug a hole and pulled the hole in
after us, that's all! When we get everything doped out
to suit us, we'll snap out of it and that bird'll think he's
been petting a wildcat!"</p>
<p>"Mart, you're the thinking end of this partnership,"
he continued, thoughtfully. "You've got the analytical
mind and the judicial disposition, and can think circles
around me. From what little you've seen of those folks,
tell me who, what, and where they are. I'm getting the
germ of an idea, and maybe we can make it work."</p>
<p>"I will try it." Crane paused. "They are, of course,
neither from the Earth nor from Osnome. It is also
evident that they have solved the secret of intra-atomic
energy. Their vessels are not propelled as ours are—they
have so perfected that force that it acts upon every
particle of the structure and its contents...."</p>
<p>"How do you figure that?" blurted Seaton.</p>
<p>"Because of the acceleration they can stand. Nothing
even semi-human, and probably nothing living, could endure
it otherwise. Right?"</p>
<p>"Yes—I never thought of that."</p>
<p>"Furthermore, they are far from home, for if they
were from anywhere nearby, the Osnomians would have
known of them—particularly since it is evident from the
size of the vessel that it is not a recent development with
them, as it is with us. Since the green system is close to
the center of the Galaxy, it seems reasonable, as a working
hypothesis, to assume that they are from some system
far from the center, perhaps close to the outer edge.
They are very evidently of a high degree of intelligence.
They are also highly treacherous and merciless...."</p>
<p>"Why?" asked Dorothy, who was listening eagerly.</p>
<p>"I deduce those characteristics from their unprovoked
attack upon peaceful ships, vastly smaller and supposedly
of inferior armament; and also from the nature
of that attack. This vessel is probably a scout or an exploring
ship, since it seems to be alone. It is not altogether
beyond the bounds of reason to imagine it upon a
voyage of discovery, in search of new planets to be
subjugated and colonized...."</p>
<p>"That's a sweet picture of our future neighbors—but
I guess you're hitting the old nail on the head, at that."</p>
<p>"If these deductions are anywhere nearly correct,
they are terrible neighbors. For my next point, are we
justified in assuming that they do or do not know about
the zone of force?"</p>
<p>"That's a hard one. Knowing what they evidently do
know, it's hard to see how they could have missed it.
And yet, if they had known about it for a long time,
wouldn't they be able to get through it? Of course it
may be a real and total barrier in the ether—in that case
they'd know that they couldn't do a thing as long as we
keep it on. Take your choice, but I believe that they
know about it, and know more than we do—that it is a
total barrier set up in the ether."</p>
<p>"I agree with you, and we shall proceed upon that
assumption. They know, then, that neither they nor
we can do anything as long as we maintain the zone—that
it is a stalemate. They also know that it takes an
enormous amount of power to keep the zone in place.
Now we have gone as far as we can go upon the meager
data we have—considerably farther than we really are
justified in going. We must now try to come to some
conclusion concerning their present activities. If our
ideas as to their natures are even approximately correct,
they are waiting, probably fairly close at hand, until we
shall be compelled to release the zone, no matter how
long that period of waiting shall be. They know, of
course, from our small size, that we cannot carry enough
copper to maintain it indefinitely, as they could. Does
that sound reasonable?"</p>
<p>"I check you to nineteen decimal places, Mart, and
from your ideas I'm getting surer and surer that we can
pull their corks. I can get into action in a hurry when<span class='pagenum'><SPAN name="Page_404" id="Page_404"></SPAN></span>
I have to, and my idea now is to wait until they relax a
trifle, and then slip a fast one over on them. One more
bubble out of the old think-tank and I'll let you off for
the day. At what time will their vigilance be at lowest
ebb? That's a poser, I'll admit, but the answer to it
may answer everything—the first shot will, of course,
be the best chance we'll ever have."</p>
<p>"Yes, we should succeed in the first attempt. We
have very little information to guide us in answering
that question." He studied the problem for many
minutes before he resumed, "I should say that for a
time they would keep all their rays and other weapons
in action against the zone of force, expecting us to release
it immediately. Then, knowing that they were
wasting power uselessly, they would cease attacking, but
would be very watchful, with every eye fastened upon
us and with every weapon ready for instant use. After
this period of vigilance, regular ship's routine would be
resumed. Half the force, probably, would go off duty—for,
if they are even remotely like any organic beings
with which we are familiar, they require sleep or its
equivalent at intervals. The men on duty—the normal
force, that is—would be doubly careful for a time. Then
habit will assert itself, if we have done nothing to create
suspicion, and their watchfulness will relax to the point
of ordinary careful observation. Toward the end of
their watch, because of the strain of the battle and because
of the unusually long period of duty, they will become
careless, and their vigilance will be considerably
below normal. But the exact time of all these things depends
entirely upon their conception of time, concerning
which we have no information whatever. Though it is
purely a speculation, based upon Earthly and Osnomian
experience, I should say that after twelve or thirteen
hours would come the time for us to make the attack."</p>
<p>"That's good enough for me. Fine, Mart, and thanks.
You've probably saved the lives of the party. We will
now sleep for eleven or twelve hours."</p>
<p>"Sleep, Dick! How could you?" Dorothy exclaimed.</p>
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