The chronicle=news., 1913-04-04
NEW illumination
IS WITHOUT HEAT

New York. April i.-On- Of tho
great ideals OF science has long been
TO produce Hight without heat. Until
recently the nearest approach to u
solution OF this problem has existed
In the incandescent electric bulb
light. Yet here the heat IL sufficient
to render the filamcnts shOri-livcd.
and TO require asbestos-lined cabl-
nets TO prevent conflasrations In
connection with moving picture
making.
hut now the Paris Academy of
Science has received reports Of sue
cessful tests OF ", Dussuad's cold
light" which mention that II is also
~Ntraordinaryily powerful. no brill
liant. in fact. that II can be used ~
y substitute for the N-ray. The re-
PORTS declare that In the hcw light
without heat. letters can be read
through their envelopes. even when
wrapped In dozen thickncsscs Of
paper.
Tho Invention. says the writer In
tho American. is based oil the prin-
cipic Of matter having need Of re-:
OF molecular equilibrium. For ca
ample. two springs working alter.
nutciy wear out NOR. slowly than II
each worked continuously. Gold
iixhi" IN tho application Of this prln-
cipic tn incante~ccnt electric lamps
Light Is concentrated Ia a single
point by all III. iiiamcnis working
successfully. and projected through
u lens multiplying thousS nd-fold.
by this process ~. Dussaud hss sue
ccctIcd In concentrating 1000 candle
power IN u single point and passing
J: volts into a S-voit lamp. which
otherwise would burst.
The advantages 'iaimed are. first.
tho elimination Of danger. since
lamp. though producing dazzling
light that II In impossible to look NJ
l; with the naked eye. can be held
IN the hand without the slightest
heat being felt. Second. such lamp
requires u hundred times less eur.
rent than the ordinary lamp. and In
tho ahscnc. of u sector II cnn be pro-
iucci by u tiny battery. Th. motive
power can bc given by m ordinary
water tap. n squirrel IN cage. vi
tn. operators foot. Third. u con-
tain. ultraviolet rays. thus rcauir-
ing a hundred iim's less electricity
than usual.
Thee. facts were all demonstrated
ON the screen. 4 beautiful coiorcd
three Yards square. to
project which ordinary lamps would
rcouir. 81 volts. or 1000 watts. only
needed 20 watts with the cold
light" costing one centimc Instead
of u frame. or u hundredtn OF the cost
All the views shown were produced
with very small and Inexpensive mp
PM atux, and henccforth similar H.
Illustrations can be given In schools by
professors without danger. the only
appliance beinK a cheap little appar-
utus that can BE- slipped Into the
pocket.
Another demonstration was a mic
rol. pnrasitc from the mouse. mag.
nified 100000 times. proving tho
advantage Of cold lixh;" In moi
spelling the most delicate prepara-
tion. which could not stand ordinary
hot illumination. We shall see mo-
more magnesium flares or suffocat-
inE fumes. for by pressing rubber
ball the Photographic shutter and
tho '''cold light" are released stimuli
tancously without noise or smell.
md tho picture is taken In q fourth
OF the time that would he required
by the us. Of magnesium.
Tho invention In especially val
liable to lighthouses and submarine
and aerial navigation. Experiments
already made At the Biarritx light.
hous. are conclusive. and NJ. Dus-
saud in now working ON n series Of
projectors for tho Ministry OF War.
Before Offering tho discovery to the
commercial world NJ. Dussaud pa
trioiically placed |; at the disposal
of the authorities.
In NJ. Dussaud's mccabnism the
email. round bulbs used are placed
NJ regular intervals of the ctrcum-
ference OF u wheel. AZ the wheel In
rcvolvcd the bulbs In succession pass
the focus OF u projection lens. II "
only whilc passing that point that
tho current IL on--bclng switched
on and off automatically. Accord
|ingly. II there are IL bulbs ON the
wheel each bulb is lighted only
about onc-sixtccnth OF the time. the
proportion OF time utilized for tho
cooling Of cch bulb. while 1t Isl
dark" being as sixteen to one.
This makes II impossible. without
destroying the filaments. to use
current Of very high tension. The
new light Ia said to be no intense
that 1t is entirely available for flash
light photography. in place of mag