--_Photo. News._
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DESRUELLES'S ELECTRIC LIGHTER
[Illustration: ELECTRIC LIGHTER.]
The little apparatus shown in the accompanying cut will certainly find
favor with smokers, as well as with persons generally who often have
need of a fire or light. It forms one of the most direct applications
of dry piles of all the systems on the Desruelles plan. Instead of
filling piles with a liquid, this plan contemplates the introduction
into them of a sort of asbestos sponge saturated with an acid or any
suitable solution. In this way there is obtained the advantage of
having a pile which is in some sort _dry_, that may be moved, shaken,
or upset without any outflow of liquid, and which will prove of
special value when applied to movable apparatus, such as portable
lighters, alarms on ships, railroads, etc. It is hardly necessary to
say that while the introduction of this inert substance diminishes the
volume of the liquid, the electro-motive force of the pile is thereby
in nowise affected, but its internal resistance is increased. This,
however, is of no consequence in the application under consideration.
The lighter consists of a small, round, wooden box containing the
pile, and surmounted by a spirit lamp. A platinum spiral opposite the
wick serves for producing the light.
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