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.
motions there is an advancement of the wave, while the 
individual particles only rise and fall without advancing. 
The slips of glass, mentioned above, can be con¬ 
veniently prepared for drawing diagrams, by coating one 
side with plain collodion (gun cotton dissolved in equal 
parts of alcohol and ether) ; when dry this surface takes 
India-ink admirably, and diagrams can be traced, or 
pictures copied in a rough way, by laying the glass plate 
so prepared over the picture to be copied and tracing 
its outline with a pen filled with good India-ink. 
I would strongly advise any one using your lantern to 
procure some of the comic slides, such as you illustrate 
in Class XV of your catalogue of slides, and they can see 
how to make similar ones to be used in illustrations 
of scientific subjects. Thus with the wreck of one of 
these three glass slides, picked up at some opticians and 
purchased for a few cents, I improvised a slide which 
answered better to illustrate the process of carbon print¬ 
ing in photography than the process itself would have 
done in a lecture-room. One figure changed with 
another by means of sliding glass plates is very useful 
in many kinds of experiments or illustrations of facts 
And processes. 
The tank figured in your manual, in Chapter VII, on 
Chemical Experiments, contributed by Prof. Morton, 
can be made to do service in a long line of experiments 
with electricity, by a very simple device. Thus, to illus¬ 
trate the decomposition of water, cut a slip) of segar-box 
wood, of a size that will lay on the bottom of the tank 
loosely, attach to this bit of wood copper wires, which 
will extend up to the end of the tank and will not quite 
meet at the centre of the bit of wood; to upturned ends 
at this place, solder little slips of platina foil, f inch long 
by i inch wide, they must stand vertically face to faco,


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