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.
It will then soon be seen which of the lettered spaces has 
received the correct exposure ; and a memorandum noting 
time and distance of lens from screen can either be 
attached to the negative, or entered in a book against a 
number corresponding with a number scratched on the 
glass negative. 
The same principle can be applied to contact printing 
in a frame on bromide paper, by gas or lamp light. When 
the frame has been charged with its negative and the 
bromide paper, support it upright at a distance of, say, 
18 inches from the turned-down flame. Now, place 
in front of it an opaque card, sufficiently large to more 
than cover the frame. This card should have a hole about 
1 inch in diameter cut in it in one corner. Turn up the 
light and expose for five seconds. Alter the position of the 
hole and give ten seconds, and so on. When the paper is 
subsequently developed the several exposures can be 
readily identified, and the negative can be labelled to the 
effect that it requires so much exposure at a given distance 
from a flame. Thus—Bromide paper, 18 in. 25 sec. This 
negative will then be an infallible guide for the exposure 
of negatives of a similar type; for a systematic worker, 
unless he be quite a beginner, will fall into the way of 
producing negatives of much the same character and 
strength, and printing from them by lamp light will then 
become an easy matter to him. 
After this somewhat long but not unnecessary digression, 
I will resume my directions for enlarging on bromide 
paper, and for the sake of simplicity will suppose that the 
operator is not supplied with the special form of easel


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