The Tabor independent. [volume] (Tabor, S.D.) 1913-19??, 1913-08-28

COLD LIGHT.
Trom ~ Amatsur Photographer.

From the Amateur photographer.
Professor Charles Dussaud, OF Paris "a
pioneer OF wireless telegraphy), has re-
Gently given a demonstration In london OF
what threatens to be a veritable revolu-
ton In lighting-power, which will be OF
particular interest to photographers. BY
It's use the production OF heat In the use
of electric light In lanterns and kline
autographs Is entirely avoided, hence its
title cold light" At the demonstration
he proved ~conclusiveIy, by experiment,
that the light could be enclosed In a pro-
iecting lantern, with paper as a substi-
tute for Russian iron, without the slight
sst risk OF o~verheating and IRE. He also
showed that notwithstanding objects as
the Interior OF the human mouth and
throat could, by its means, be projected
On to a screen for demonstration or other
purposes In their natural coloring without
the slightest Inconvenience to the owner
from the heating OF the Tampa tiny thing
an inch or so In diameter. For lantern
lists the special advantage was shown to
De that iantern-slides made OF film could
be safely used In place Of glass. this
avoiding the annoyance Of weight, ex-
9ense danger OF breakage, n difficulty
If conveyance. s .@a,"
The system is a highly Ingenious one.
and II combines with the absence Of heat
an enormous increase In lighting-power.
Mo D6 SITlCLly uflSClGuLlitCs GNSTyOH0 hlkOWb
that IL a lamp Is attached to a higher.
voltage than that for which 1t is made, IL
dives a fine Increased light for a short
time and then bursts. Professor Dussaud
attaches an ordinary ACKNOWLEDGEMENTS
amp to double the voltage for which 1t Is
made, and II gives at once a 100 candle-
power light; nor does 1t burst, or even
grow warm. He obtains this end by In
terruptlng the current. This can be done
X,rffh n uipoIa" In nm hy quitting off fhaE mr.
rent for the fraction Of a moment and
then restoring II, and repeating this OPP
~sration; or, better still, by using three OF
the small lamps revolving, SO that each
one touches O contact and IS lighted, and
then has a double period of rest, during
which such fraction OF heating, IL any,
as 1T has received is cooled out and lost.
So far as the eye can perceive the lighting
Is continuous. Actually, the three little
lamps are revolving. One is lighted, ia
revolved past the point OF contact, N
the next then CLOVIS in its place. The inn
mense Increase In lighting power Is OBJ
tanned without any increase In con-
sumption. The advantage of this TO the
lanternist should be incalcuIable, and the
densest color-slides should be showable
from the ordinary domestic supply. 1t IL
claimed that, by the use of this non-leat-
ing light, celluloid a. be safely utilized
i'm the kinematograph, Moreover, the light
can be produced from q very small bat
terry or accumulation, and therefore In an
unwired building. 1t was quite a reyolu-
ton In itself to see a tiny lamp In work
at the demonstration, showing bravely a
colored slide In a courtyard circle on the
screen, and shaming by Its performance
an arc lamp I'm a ynntern double its size
on a neighboring table. A special advant-
age OF this system for the acknowledgement
should be tina by its use the film can be
stopped at any moment for demonstration
or other purpose ad nbitum.