The sun. [volume] (New York [N.Y.]) 1833-1916, 1914-12-06


and its origin found by tho trace ~ {,
beams against the gloom. Of course 30.
direction is instantly revealed when ,7.
light il thrown in ones face.
| But in the daytime this is very ,r,,,,
modified. The flash Of a helioyrap, ,.
a bit OF looking glass catching the sun,
rays can be seen only when ,he 20.
fiected beams come directly toward ON.
as there Is no visible trace t'lrougb
illumined space of the light a. In m.
case at night. Therefore. BY usiur
searchlight in the daytime Mr. Ham.
mond can guide his beams upnn
! chosen path and effect his purpos. with
. very narrow arc open to discover,
| Indeed. an enemy would not ne rk.,
To understand the object Of the na.lo.
and might reasonably think tner
harmless and Of an accidental origin
Tho boat which the Army Board Ia.
| Just examined has been controlled hy
means Of A - inch searchlight II. con
! junction with "A selenlum cell ~ .,
treme sensitiveness aboard the craft
Mr.. Hammond has used wave length.
Of but LAO 900 OF an inch long. and IN,
| receiver in tho vessel Il. responsive on',
when the properly toned light beam.
have reached il. Then they crinrlo,.
the various circuits and are respons "
10 the impulses that set in motion tie
various mechanical functions having 10
do with the steering, Sc, OF the Graf
Now. wha. is the practical form thls
invention Is 20 take as medium ., coa~
defence? The biggest OF modern auto
mobile torpedoes carry not mora thar
300 pounds OF explosive in their wa
heads. Even so. they have dfficuliir.
10 combat which lessen their chance,
Of reaching their mark. The 'orpedo
can now travel quite 10000 wards. no
best of them starting upon their iour.
news az a speed little short ~ nty
knots an hour. But hey are losing
speed from the moment they leg.n
their run, and It takes some minutes
for them to traveG their maximum Dis
lance. In the meantime he foe may .,
moving and the problem * TO make
allowance for this period Of travel I'D
the point at which the target VII ar~jv.
co.ncidentlv with the torpedo mod \
IT,
Mr.. Hammond aims 10 overcome j".
difficulty by making his torpedo 81
ject 10 directional control at D.c-v
stage 81 its run. To do this. no m <
ard 20 that end either the body ~ .t.
craft or a mast must rise above ~
surface ~ the sea. In ne daytime
this visibility - poss ible for 4 distance
or nearly nine miles, provided 60" t.-
mosphere is clear. Al night III" foi' Sc
.Hg rays ~ the directive searcN''-Nt
will serve "a keep tho boat in '..r
hu: he same end can he made O.. "
NOR" certain Is carrying ugh' ~
combination 81 signal lights upu.
mast Of tho craft 90 placed that ths
are Visible rearward only. Thcsa -.
merely matters OF detail
In order TO control his vesSe.
nayiga 'ional sense Mr. Hammond 90
pluys the directional force oc porc.-.
fu gvroScop" which is made Zoo -~r
the rudder and to hold II steady o..
the true path Is determined In or's'
20 facilitate manpuvriue. this grip ,7-
be broken by the wireless .mpu' =
and he helm swung from SIDE p, $40
urtl ne observer ashore has -" ""'-
SCI once more upon the desired cor"es
This l"aveS nothing to chance
As long a. the man a. thc op"rs ''--
s'at.ou can see the torpedo hna' ="
such no invention is. Il : poss,h,c -
HIM % shift its course 80 thai
certainly run down It's dua-r;'. 'r-'..
Of carrying an explosive c'trE- ~ "a.
nr tire" hundred pounds tho Iamw q
craft can bear n much bigger I'd '-or.
for" a Ear more destructive burdc'
II is easy To- understand ~ rg'
such a weapon used agains' % He'.
hoS'tl" battleships nearing oro ~ f.
ports. Th" ordinary auiomoh.c '..N...
might miss its mars when css.,-r. o..
halt the enemy before his guns cow
come w.:Hn effective bomla. ."r
range, But not SO with the HtnW'-.
weapon \ dozen or no,~ ~ those .~''
could b. gent after the E. and -u %
:" thar they might make tN'.~ t.".
attack from MANY different pou',