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

Page scan 00018 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 #:
00018
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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CHAPTER I. THE CONTACT METHOD. TWO methods of making lantern slides will be carefully described. The first will be called the "contact method," which consists in print- ing on prepared sensitized glass, just as if it were paper. It is done by placing a negative in an ordinary printing frame, and then adjust- ing the gelatine surface of a prepared slide plate directly against the image on the negative, and keeping it in firm contact with the latter by means of the springs of the pressure board of the printing frame, while actinic light is allowed to shine through the negative upon the slide plate. The thicker portions of the negative stop the light to a certain degree, and, therefore, there is little or no chemical action upon the corresponding parts of the slide plate. The thinner portions allow more light to pass; therefore, there is more action upon the corre- sponding parts of the slide, so that the chemical action of the light upon the various parts of the slide plate depends upon the thickness of the respective parts of the negative. Moreover, it also depends upon the length of time that the light acts upon the plate. The exposure may be so long that too much action takes place, even under the thickest parts of the negative, so that the delicate gradations