The Electrical experimenter
The Electrical experimenter
The Electrical experimenter
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66 THE ELECTRICAL EXPERIMENTER May, 1917<br />
" r Your Hoine<br />
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MWhTrfrit-t-tTi<br />
EDDY CURRENTS.<br />
{Continued from page Jl)<br />
as one of the fleet when the war had<br />
broken out. I tried to ask him questions,<br />
but lie was as clamin\- as Parker and I<br />
could get notliing out of him.<br />
What was behind that locked steel door?<br />
Was the means of destroying the enemy's<br />
ships concealed there? What was this<br />
curious torpcdoless means? I wanted to<br />
ask Parker, but pride and shame at my<br />
own stupidity held me back. So I wondered<br />
and pondered and puzzled all that<br />
day.<br />
Thought of the aflair was dispelled when<br />
about sundown the lookout sighted an<br />
enemy aeroplane dead ahead and some distance<br />
aloft. We immediately sank to the<br />
awash condition and then as the plane<br />
grew near, we submerged with only our<br />
periscope showing. This we drew in as<br />
we noted that the aeroplane sighted us<br />
and swooped down for a look. We ran<br />
submerged for a half hour or so and then<br />
cautiously poked up our periscope.<br />
<strong>The</strong>re was a sudden cry of warning from<br />
the man at the instrument and we dove<br />
again. <strong>The</strong>re had been an enemy torpedo<br />
boat destroper near, and even in the dusk<br />
it was not safe to come up when any of<br />
these craft were about. We had been<br />
sighted we knew, for its searchlights made<br />
the water dimly translucent above us.<br />
But we submerged below the light and ran<br />
still east by north.<br />
It was just after this that I noticed that<br />
Billy came to the feeler case. I heard<br />
him give directions that the small alternator<br />
which supplied the coil with current,<br />
should be started. <strong>The</strong>n he worked the two<br />
control wheels, and by glancing over his<br />
shoulder at the dials 1 saw that he was<br />
sweeping the coil from side to side, and<br />
frequently changing its inclination. By<br />
this means he was throwing out an arm<br />
of magnetic force which would indicate the<br />
position of any enemy ship within ten<br />
thousand yards.<br />
"ffunting for fish?" I asked.<br />
"Ves, I'm feeling for them," he answered,<br />
watching the angle of the horizontal<br />
gage, and then turning to me with<br />
a twinkle in his eye. "Have you solved<br />
it yet?"<br />
"Xo, I haven't," I admitted.<br />
"Vou watch tonight then," he said.<br />
"We're about due to be in the enemy's<br />
fleet and we ought to have some experience<br />
at least."<br />
<strong>The</strong> light on the case before him flashed<br />
suddenly red, and the dial needle marking<br />
distance jumped up to eight thousand and<br />
stopt there. He turned and held the horizontal<br />
control wheel stationary a moment.<br />
"We're in them now," he said. "<strong>The</strong>re's<br />
the first one."<br />
<strong>The</strong>re followed a most wonderful piece<br />
of maneuvering. He turned the coil until<br />
he was sure of the position of the enemy,<br />
and then changed the course of our boat<br />
to correspond to his. Slowly we worked<br />
around, the little coil giving us the position<br />
of our foe with its unerring magnetic<br />
touch.<br />
In half an hour we were making twentytwo<br />
knots west by south and running thirty<br />
feet under. <strong>The</strong> enemy was oflF to starboard<br />
according to our indicator.<br />
"He must be a battleship. Twenty-two<br />
is too slow for anything else," Billy said.<br />
I agreed and a moment later, with a<br />
final assurance that our courses were<br />
parallel, Billy turned to a locked case beside<br />
the feeler bo.\. I glanced at the dial.<br />
<strong>The</strong> enemy was just 1436 yards away according<br />
to our readings.<br />
Rilly was opening the case which looked<br />
exactly similar to the feeler, but lacked<br />
the lamp and distance dial and had only<br />
Ycu benefit by mentioning "<strong>The</strong> <strong>Electrical</strong> Exl^erimentcr" when writing to advertisers.<br />
two control wheels. Under it was a small<br />
electric pushbutton whose function I<br />
could not understand.<br />
He twisted the control wheels for a<br />
moment until the dials read the same as<br />
those of the feeler. <strong>The</strong>n he called down<br />
the speaking tube.<br />
"Start the alternator."<br />
"Ves, sir," came back Dickenson's reply.<br />
I heard faintly above the other machinery<br />
the starting crescendo of a turbine.<br />
"Here goes for a trial," Billy said.<br />
I watched him, and with a final glance<br />
to make sure that both dials corresponded,<br />
he deprest the button. <strong>The</strong> machine forward,<br />
the alternator, I thought, dipt several<br />
notes in its hum and then rallied. <strong>The</strong><br />
button was down for four or five minutes<br />
and then he let it up and gave the command<br />
to stop the alternator.<br />
What had he done? Had this deprest<br />
button let loose some mysterious new force,<br />
some wonderful ray, some hitherto undiscovered<br />
etherial vibrations which could<br />
travel through water and destroy the enemy<br />
ship alongside us? Wliat had he done when<br />
lie prest that button? I wanted to ask<br />
him, but again pride and chagrin stopt<br />
me.<br />
Instead I went to my instruments, thinking<br />
that I might pick up some of the<br />
enemy's talk and hear something worth<br />
knowing. To this purpose I juggled my<br />
tuner knobs, getting many and rapidly<br />
changing combinations with the sliding<br />
contacts.<br />
It was while doing this that I heard a<br />
sudden loud buzz in the receiver. I held<br />
the adjustment there a moment and heard<br />
several letters, apparently forming a foreign<br />
word. <strong>The</strong>n I listened while a message<br />
in the enemy's tongue was spelled<br />
off loudly into my receiver. I wrote it<br />
down as it came. When it had stopt and<br />
1 had translated it, I had before me the<br />
following<br />
"<strong>The</strong> fire in the forward port compartment,<br />
Xo. 7, is in the oil tanks and is so<br />
hot that it has melted out a section of the<br />
hull plates. We have a heavy list to port.<br />
but are not in immediate danger. Good<br />
luck.<br />
"Captain \'on Heissburg,<br />
"<strong>The</strong> Stoltzenfels."<br />
That looked as if there was trouble in<br />
one of the enemy's ships. I showed the<br />
message to Billy.<br />
He read it over twice and then glanceil<br />
up with a gratified light in his face.<br />
"Pretty good, but not quite enough," he<br />
said. "Have to use more next time I<br />
guess," and he turned away to the feeler<br />
case.<br />
I could make nothing of this remark<br />
and did not try to. I was too busy watching<br />
him again.<br />
Once more he was sweeping with the<br />
feeler. We were bearing off to the south<br />
and running slowly. .\gain the light<br />
flashed and he twisted controls and helm<br />
until we ran parallel with the enemy. 4.^<br />
yards away and off his starboard side.<br />
Once again we were thirty feet under am'<br />
running at twenty-two knots, which seemed<br />
to be the speed of the fleet. As before<br />
Billy twisted the controls on the other and<br />
un-named case until the dials read the same<br />
as the feeler. Once again he called the<br />
order to start the alternator. <strong>The</strong> hum of<br />
the machine sounded and as before the<br />
button was prest. I timed it now and<br />
found that it was held down six and a<br />
half minutes.<br />
<strong>The</strong>n we sheered off to the south, slowing<br />
up and letting the enemy pass ahead<br />
of us.<br />
I watched again in intense but unsatisfied<br />
curiosity while Rilly twisted and<br />
and turned the little wheels and after our<br />
boat came parallel to the enemy, prest the