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.
water on top is run off by means of an india-rubber tube, 
acting as a siphon, the weights replaced on the pan, and 
the holder is ready for refilling. 
“Where the oxy-hydrogen light is much used, holders are 
almost indispensable, and in all cases effect a large saving of 
time and material in the preparation and use of the gases.” 
The above illustrated article has been préparée! for the 
purpose of affording a practical guide in constructing similar 
gas-holders, wherever the plan is approved. If the tubs 
are made at any distance away, they can be brought in parts 
to the place they are to occupy and there set up. The joints 
of the galvanized iron holders are made gas-tight with solder. 
Wherever illuminating gas is in use, the hydrogen gas 
holder can be filled with it, as is done at the Franklin 
Institute. If either the alcohol burner, or the concentric 
jet with house gas direct from the main is used, only an 
oxygen gas holder is required. 
So far as we now know, it seems best to generate the gases 
by repeated use of the apparatus described on pages 165 
and 167. With two retorts, one accustomed to the operation 
can roast a double oxygen charge in each alternately till 
eight pounds are used, which about fills a gas holder of the 
dimensions described. 
The use of gas holders renders projecting apparatus much 
more available in educational institutions, because the gases 
can be made in large quantities at once, stored for an in¬ 
definite time without deterioration, and used whenever 
occasion requires, without delay, with only such darkening 
as can be readily effected, either at evening or in the daytime. • 
A desire to render the lime-light apparatus more conven¬ 
ient, inexpensive, safe and portable, gives rise to various


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