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

Page scan 00023 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 #:
00023
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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18 This apparatus, while it is admirably adapted to the purpose of exposing slides, is rather ex- pensive; for, in addition to the jet itself, which costs $1.25, a spark coil ($3) and a battery of three or four cells (50 cents per cell), are neces- sary. The most convenient battery is the " dry " form of cell. The whole apparatus costs about $6. This is the form of actinic light used by the author, and it leaves nothing to be de- sired. Any length of exposure may be obtained with the utmost ease. It has never failed; and when the gas is turned off, the light is entirely extinguished. Another form of jet, while not equal to the first in every respect, is quite well adapted to the purpose. It is a gas-jet with a "by-pass," screwed upon a small iron stand, which may be connected with any gas fixture by means of rubber tubing. The flow of gas is controlled by a stop-cock, which is connected with a very small " by-pass " tube at one side. The gas is first turned on and lighted as an ordinary jet. As the stop-cock is turned, it opens the by- pass tube so that a very small flow of gas escapes at the orifice and is lighted by the main flame just before the latter is extinguished. This little by-pass jet continues to burn as long as the main jet is turned off. When the main jet is gradually turned on, it is lighted by the small jet, which is completely extinguished when the main jet is full on.