Bauhaus-Universität Weimar

The Sciopticon Manual, Explaining Lantern Projections in General and the Sciopticon Apparatus in Particular Including Magic Lantern Attachments, Experiments, Novelties, Colored and Photo-Transparencies, Mechanical Movements, etc.
Marcy, L. J.
able beat is produced in making the mixture, and for 
this reason it should be made beforehand in an earthen¬ 
ware, not a glass vessel, so as to allow sufficient time for 
it to become cool before being added to the granulated 
zinc contained in the generator a (Fig. 47). 
About two pounds of zinc is introduced into the 
generator (a glass bottle to hold five gallons or more, 
or a vessel made of lead), the top of which, bearing the 
tube funnel and bent exit tube, is then replaced, and the 
joint being made airtight (in the case of a leaden gene¬ 
rator by means of a screw, and in the ease of a glass 
bottle, by a metallic stopper coated with rubber), the 
diluted acid is poured down the long tube funnel b, the 
end of which descends far enough into the liquid to 
prevent the return of gas in that direction. A brisk 
action ensues, the gas effervescing like so much soda- 
water. The first portions should, however, be allowed 
to escape for some minutes at the outlet of the wash 
bottle c, to expel the air. To ascertain when hydrogen 
begins to flow, we might apply a light to soap-bubbles


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