Optic projection : principles, installation and use of the magic lantern, projection microscope, reflecting lantern, moving picture machine, fully illustrated with plates and with over 400 text-figures (1914)

Record Details:

Title:
Optic projection : principles, installation and use of the magic lantern, projection microscope, reflecting lantern, moving picture machine, fully illustrated with plates and with over 400 text-figures
Date:
1914
Author:
Gage, Simon Henry, 1851-1946
Publisher:
Ithaca, N.Y. : Comstock Publishing Co.
Volume:
Optic projection : principles, installation and use of the magic lantern, projection microscope, reflecting lantern, moving picture machine, fully illustrated with plates and with over 400 text-figures
Leaf #:
00072
Language:
English
Format:
Books
Contributor:
Gerstein - University of Toronto
Sponsor:
MSN
Coordinator:
Media History Digital Library
Description:
Bibliography: p. 693-703
Date Added:
July 19, 2022
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CH. I] TROUBLES WITH THE MAGIC LANTERN 57 or starch process is one of their great drawbacks. Only powerful radiants give satisfactory screen images. § 93. Shadow on the screen with water-cell. In case the water in the water cell has evaporated in part there will be a very disagreeable shadow on the lower part of the screen (fig. 31). It is on the lower part of the screen although it is the upper part of the water cell that will be empty. This is due to the inverting action of the objective. FIG. 31. SHADOW ON THE LOWER PART OF THE SCREEN WHEN THE WATER-CELL is BUT PARTLY FILLED. S Screen image with shadow on the lower side. The water is of course present in the lower part of the water cell, and absent from the upper part; but, owing to the inversion produced by the objective, the screen image shows the shadow on the lower part. Occasionally the water is entirely absent from the water-cell. Then there will be a very poor screen image, the entire screen being affected by the obscurities on the dry surfaces of the water-cell. BREAKING OF CONDENSER LENSES § 94. It is usually the lens next the radiant that cracks or becomes shattered. This is due to the too rapid heating or cooling of the condenser lens, or to the mounting, which may be too rigid to allow of free expansion of the lens as it becomes hot. Condenser lenses are especially liable to break: (i) When too heavy currents are used; (2) when the lamp-house is not well and evenly ventilated; (3) when currents of cold air strike the hot condenser; (4) when the lens mounting is not provided with ventilating openings for free circulation of air between the lenses;