The Electrical experimenter

66 THE ELECTRICAL EXPERIMENTER May, 1917
" r Your Hoine
/ The Uni-Lectric ia a (Jomplete electric
service station in home size. Generates
standard 110-volt direct current. Big capacity—operates
one to 50 lights, electric
' motors up to 1 h. p., electric irons, electric
heaters, vacuum cleaners, force pomps,
chums, separators, washinp machines, etc.—
24 hours a day. everyday in the year if yoa '
wish. Uses standard lamps and fixtures.
No Belts-No Batteries\
Our patented, high-speed , rotary sleeve valve ecelne
operates the modem, high-speed Keocrator with such
smoothness that alt necessity for storapo batteries Is
eltminated. Thus the renewal of batteries and battery
op-keep cost is entirely done away with. Outfit comes lo
one small compact anlt, ready for quick installation,
^ Simple, dependable and economical. The entire outfit
E ffoaranteed for five years. Write today for free cop; of
\ oar new catalog od farm Uebtdos plants.
\ Waterman Motor Company /
\ l!2 ML Elliott Ave. Detroit, Mich. /
The OTMf home m:e
liohtino plant^ that
V opi^atts without
atorage batter- gUni-Lec-tricJ
'mimz NONTH
12
genuine 15-1 7-19-21-
\ Jewel Eleio. Waltham. Howard.
ny watrh you want, eeud for
' r»\ -\ E-/mvi pages of wooclerful values, dla-
• V* ^^^ >^y roopda. watches, rings. Jewelry, upk-.
^*u'^*'.-^^to-d?.te deeigna. Buy the Ware Way,
70U will never miss tbs money. G-et
ited. write today.
[ALFRED WARE CO.. Dept. 705 St. LoaU. Mo.
ACORN UNI-LITE
FREE
Turns ripht into day
300 candle power.
Jarry as a lantern; nse
anywhere as a lamp. Weatherproof. For
house, bam. garage, camp and around the
farm. Write for big. free offer. Special
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Tnotorists. Agents make big mofiey.
Write tonight for new 191; offer.
ACORN BRASS yF6. CO., 22lhii-LleBUB..Cbinn
TYPEWRITERS
$10 and Up All Makes Save $25 to $50
on rebuilt at the factory by the wellknown
"Young Process." Sold for low
ca^-h—installment or rented. Rental
applies on purchase price. Write for
lull details and gu.^rantee. Free trial.
Young Typewriter Co., Dept. 176, Chicago
ELECTRICITY
I can teach you by practical work the Electrical
profession in your own home. Short time required
and easy payments. MATERIAL and TCX)LS
FREIE. Write me to day for free book on Electricity.
L. L. COOKE, Dept 21
439 Caw Street CHICAGO, ILU
^= Superb Cornet
An astoundins offpr. Pay the balance at
^.^^ the ratp nf li>c a day. Free trial before
Ba'na Catato^/
WUPLIIZER:""'
^'\**"*'*-'Vs*nd ua T'wir nam... and ji.idreM The
•«»4e*ri tr(iniirurftemoi»lung 2b0v^ge book _ . . ._ ia __ frpo ..
inatruiiii:nta ar« ahown. Roo k -bottoin
rr*« Carrying C«»« prii'pa—eaay payments. Generous allow*
with thtB S upcrb ance for old (nstruments. We upfr
tho U. S. G-vt. Write
Trirle Silver l'l«t«J
U)d*y.
lytic comet, Rrnuine THE RUDOU^H Wf m.|TZEII CO.
ipi^,,aM.O 0#ot T44 5 Clilc.«>. Itt
MWhTrfrit-t-tTi
EDDY CURRENTS.
{Continued from page Jl)
as one of the fleet when the war had
broken out. I tried to ask him questions,
but lie was as clamin\- as Parker and I
could get notliing out of him.
What was behind that locked steel door?
Was the means of destroying the enemy's
ships concealed there? What was this
curious torpcdoless means? I wanted to
ask Parker, but pride and shame at my
own stupidity held me back. So I wondered
and pondered and puzzled all that
day.
Thought of the aflair was dispelled when
about sundown the lookout sighted an
enemy aeroplane dead ahead and some distance
aloft. We immediately sank to the
awash condition and then as the plane
grew near, we submerged with only our
periscope showing. This we drew in as
we noted that the aeroplane sighted us
and swooped down for a look. We ran
submerged for a half hour or so and then
cautiously poked up our periscope.
There was a sudden cry of warning from
the man at the instrument and we dove
again. There had been an enemy torpedo
boat destroper near, and even in the dusk
it was not safe to come up when any of
these craft were about. We had been
sighted we knew, for its searchlights made
the water dimly translucent above us.
But we submerged below the light and ran
still east by north.
It was just after this that I noticed that
Billy came to the feeler case. I heard
him give directions that the small alternator
which supplied the coil with current,
should be started. Then he worked the two
control wheels, and by glancing over his
shoulder at the dials 1 saw that he was
sweeping the coil from side to side, and
frequently changing its inclination. By
this means he was throwing out an arm
of magnetic force which would indicate the
position of any enemy ship within ten
thousand yards.
"ffunting for fish?" I asked.
"Ves, I'm feeling for them," he answered,
watching the angle of the horizontal
gage, and then turning to me with
a twinkle in his eye. "Have you solved
it yet?"
"Xo, I haven't," I admitted.
"Vou watch tonight then," he said.
"We're about due to be in the enemy's
fleet and we ought to have some experience
at least."
The light on the case before him flashed
suddenly red, and the dial needle marking
distance jumped up to eight thousand and
stopt there. He turned and held the horizontal
control wheel stationary a moment.
"We're in them now," he said. "There's
the first one."
There followed a most wonderful piece
of maneuvering. He turned the coil until
he was sure of the position of the enemy,
and then changed the course of our boat
to correspond to his. Slowly we worked
around, the little coil giving us the position
of our foe with its unerring magnetic
touch.
In half an hour we were making twentytwo
knots west by south and running thirty
feet under. The enemy was oflF to starboard
according to our indicator.
"He must be a battleship. Twenty-two
is too slow for anything else," Billy said.
I agreed and a moment later, with a
final assurance that our courses were
parallel, Billy turned to a locked case beside
the feeler bo.\. I glanced at the dial.
The enemy was just 1436 yards away according
to our readings.
Rilly was opening the case which looked
exactly similar to the feeler, but lacked
the lamp and distance dial and had only
Ycu benefit by mentioning "The Electrical Exl^erimentcr" when writing to advertisers.
two control wheels. Under it was a small
electric pushbutton whose function I
could not understand.
He twisted the control wheels for a
moment until the dials read the same as
those of the feeler. Then he called down
the speaking tube.
"Start the alternator."
"Ves, sir," came back Dickenson's reply.
I heard faintly above the other machinery
the starting crescendo of a turbine.
"Here goes for a trial," Billy said.
I watched him, and with a final glance
to make sure that both dials corresponded,
he deprest the button. The machine forward,
the alternator, I thought, dipt several
notes in its hum and then rallied. The
button was down for four or five minutes
and then he let it up and gave the command
to stop the alternator.
What had he done? Had this deprest
button let loose some mysterious new force,
some wonderful ray, some hitherto undiscovered
etherial vibrations which could
travel through water and destroy the enemy
ship alongside us? Wliat had he done when
lie prest that button? I wanted to ask
him, but again pride and chagrin stopt
me.
Instead I went to my instruments, thinking
that I might pick up some of the
enemy's talk and hear something worth
knowing. To this purpose I juggled my
tuner knobs, getting many and rapidly
changing combinations with the sliding
contacts.
It was while doing this that I heard a
sudden loud buzz in the receiver. I held
the adjustment there a moment and heard
several letters, apparently forming a foreign
word. Then I listened while a message
in the enemy's tongue was spelled
off loudly into my receiver. I wrote it
down as it came. When it had stopt and
1 had translated it, I had before me the
following
"The fire in the forward port compartment,
Xo. 7, is in the oil tanks and is so
hot that it has melted out a section of the
hull plates. We have a heavy list to port.
but are not in immediate danger. Good
luck.
"Captain \'on Heissburg,
"The Stoltzenfels."
That looked as if there was trouble in
one of the enemy's ships. I showed the
message to Billy.
He read it over twice and then glanceil
up with a gratified light in his face.
"Pretty good, but not quite enough," he
said. "Have to use more next time I
guess," and he turned away to the feeler
case.
I could make nothing of this remark
and did not try to. I was too busy watching
him again.
Once more he was sweeping with the
feeler. We were bearing off to the south
and running slowly. .\gain the light
flashed and he twisted controls and helm
until we ran parallel with the enemy. 4.^
yards away and off his starboard side.
Once again we were thirty feet under am'
running at twenty-two knots, which seemed
to be the speed of the fleet. As before
Billy twisted the controls on the other and
un-named case until the dials read the same
as the feeler. Once again he called the
order to start the alternator. The hum of
the machine sounded and as before the
button was prest. I timed it now and
found that it was held down six and a
half minutes.
Then we sheered off to the south, slowing
up and letting the enemy pass ahead
of us.
I watched again in intense but unsatisfied
curiosity while Rilly twisted and
and turned the little wheels and after our
boat came parallel to the enemy, prest the