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.
than half full of water. Lute on the cap with moistened 
plaster of Paris, and make the connections as shown in 
the diagram, except that the outlet pipe,/, of the wash- 
bottle may be left open for a moment or so, until the 
flow of gas expels the air ; see that the stop-cock is open 
and that the tubing is unobstructed. 
Apply sufficient heat to almost immediately melt that 
portion of the charge in contact with the bottom of the 
retort, then as the rest melts in turn the operation will 
be gradual. A slow fire is to be avoided ; for it, after a 
tedious waiting, raises the whole charge to about the 
melting point, when the decomposition suddenly pro¬ 
ceeds with frightful rapidity, perhaps choking the ncs- 
sages and parting the connections. The connections, 
however, are so easily parted that there will be at the 
worst only annoyance and loss of gas, but no danger. 
It is a common recommendation to abate the heat if the 
flow is too rapid, but with a good heat from the start, 
the operation is expeditious and safe. 
When the bubbling ceases and we conclude from the 
quantity of gas that the charge is spent, we disconnect 
the retort and remove it from the fire, and close the stop¬ 
cock at the bag. 
It rusts the retort less to break up the residuum with 
a rod, getting it out dry; but it is easier and perhaps 
better to pour in water and rinse it out, drying the 
retort directly afterwards. 
Hydrogen, one of the constituents of water, is pro¬ 
duced by decomposing that fluid with zinc and sulphuric 
acid. A few hours before generating the gas, a mixture 
of, say four pounds of strong sulphuric acid (oil of 
vitrol) and four quarts of water is made. Consider-


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