Bauhaus-Universität Weimar

The Book of the Lantern. Being a Practical Guide to the Working of the Optical (or Magic) Lantern. With Full and Precise Directions for Making and Coloring Lantern Pictures.
Hepworth, T. C.
Melt by heat, but not above 120° Fahr. Then in a 
yellow light, pour B into A, stirring rapidly all the time, 
and finally adding C. Allow the emulsion thus made to 
remain for one hour, at the temperature already stated, 
and then put aside in a dish to set. The washing, filtering, 
and coating operations are the same as those described for 
bromide plate making. The bright yellow light allowable 
is a great help to comfortable working of this process. 
Chloride plates are useless, on account of their slowness, 
where a slide has to be reduced, by means of the camera, 
from a negative larger than itself. Nor do I advise the 
amateur to adopt them unless he can work by daylight, 
or is fortunately situated like one I know, who lives oppo¬ 
site to an enterprising tailor who displays an electric arc 
light in front of his door. For the chloride plate is most 
insensitive to yellow light, such as that afforded by gas. 
For this reason, most commercial makers advise that the 
light chosen should be that procured by burning an inch of 
magnesium wire at a distance of so many inches from the 
printing-frame. This advice is not difficult to follow, but 
it is very difficult to make two pieces of wire give out 
exactly the same amount of light ; for magnesium wire has 
a habit of dropping down in a languid manner under the 
influence of its own heat, and going out suddenly when it 
ought to shed its radiance abroad. With diffused daylight 
all is plain sailing. The negative, with its chloride plate 
in contact with it, is exposed, say, for three seconds to 
daylight, and is then dropped into the developer. Here 
is a good one, devised, if I remember rightly, by 
Mr. Edwards :—


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