Bauhaus-Universität Weimar

Titel:
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.
Person:
Marcy, L. J.
PURL:
https://digitalesammlungen.uni-weimar.de/viewer/image/lit39449/128/
136 
SÖIOPTICON MANUAL. 
breathing on and thoroughly rubbing it with tissue- 
paper is sufficient for the cleaning. Of course the fin¬ 
gers must not touch the surface of the glass after it is 
cleaned. 
The next step is to prepare the surface of the glass 
for the drawing. If the glass (as is usual with this kind) 
is slightly curved, the concave side should invariably be 
the surface to receive the preparation. This preparation 
is as follows : “ The plate to be dusted and gently warm¬ 
ed; then flow the surface with No. 1 varnish, and drain 
into the bottle from the corner of the glass. When this 
is dry, flow with No. 2 in the same manner, and after¬ 
wards dry with gentle heat. Of course until the var¬ 
nish is dry the corner from which the varnish was 
drained should be kept down. Should dust find its way 
into the varnish, it can be filtered.” Having prepared 
the surface, it should not be soiled by handling (always 
take the glass by the edge between the fingers). A 
sketch can now be made on the surface with a good 
hard black-lead pencil, either as an original drawing, 
with the glass on the easel, or by placing the glass on 
an engraving or other picture, and tracing the outline. 
When this sketch or outline is finished, strong and 
black lines and marks can be made with the “ liquid 
India-ink ” in a fine pen, gently used so as not to make 
the lines too coarse and heavy. With the pen, too, lines 
can be ruled or letters or figures added. After the 
drawing is finished and dry, any little corrections or 
scratches can be made with the pointed eraser. 
The easel should be so placed that the light falling on 
the white tablet will be reflected to the eye of the artist 
through the inclined glass on which the picture rests, 
and consequently the picture will be illuminated by 
transmitted light. 
The easel may stand on a table placed against a win-
        

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