Lantern slides, how to make and color them (1897)

Page scan 00035 from Lantern slides, how to make and color them

Record Details:

Title:
Lantern slides, how to make and color them
Date:
1897
Publisher:
New York : E. & H.T. Anthony
Volume:
Lantern slides, how to make and color them
Leaf #:
00035
Language:
English
Collection:
Books
Format:
Books
Contributor:
University of California Libraries
Sponsor:
MSN
Coordinator:
Media History Digital Library
Date Added:
July 19, 2022
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28 fully done, the negative may be scratched or broken. Put away, or close, the opened box of plates. The plate is now ready for exposure to actinic light. Hold the frame so that the light, when turned on, may fall perpendicularly upon the negative at a measured distance from the source of the light, say, 2 feet. These two points must be carefully noted, for, in the first place, the sharpness or distinctness of the image depends upon the direction in which the light passes through the negative. When the rays pass through it perpendicular (at right angles) to its surface, the sharpest image is obtained. In the second place the negative should be at a known distance from the source of light, because the intensity or active power of light varies inversely as the square of the distance from its source. That is, if the negative, at a distance of 2 feet from the light, requires an exposure of four seconds, at one-half of the dis- tance, i foot, it would require an exposure of only one second to obtain the same result. At twice the distance, 4 feet, it would require an exposure of sixteen seconds. Therefore be careful about these little things, or there will be variations in the results of the exposures, even when exactly timed. To return to the work : Hold the frame as directed and turn on the actinic light for two seconds by the clock. Re-