Optical projection: a treatise on the use of the lantern in exhibition and scientific demonstration (1906)

Record Details:

Title:
Optical projection: a treatise on the use of the lantern in exhibition and scientific demonstration
Date:
1906
Author:
Wright, Lewis, 1838-1905
Publisher:
London, New York, Bombay : Longmans, Green and Co.
Volume:
Optical projection: a treatise on the use of the lantern in exhibition and scientific demonstration
Leaf #:
000117
Language:
English
Collection:
Books
Format:
Books
Contributor:
University of California Libraries
Sponsor:
MSN
Coordinator:
Media History Digital Library
Description:
Date Added:
July 19, 2022
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102 OPTICAL PROJECTION of sheet-iron (fig. 57). In the better class this is enclosed rather loosely in a wooden case. Such lanterns are usually worked (with oil) very near the screen, a combi- nation-lens of 4J inches focus being most usual. As regards thus using a single lantern with an oil-lamp, nothing need be added to what has been said in Chapter III., ex- cept that all the lenses will, of Fio.57.-Iron Lantern <JOUrse, ^ Bright and clean, or, if not so, will be fresh wiped with a wash-leather, kept for that purpose alone in a collar-box, or something of that kind, and religiously preserved from grease. A wash-leather once greased anywhere, is of no further use until washed. The lamp is fitted to its proper place, and it only has to be trimmed and attended to, and the slides properly focussed with the rack and pinion. When such a lantern is used with a tray and jet instead of the lamp, again all the needful directions for the manage- ment of the light have been given in Chapter IV., but it will be necessary now to carefully centre and adjust the light in the manner described under ยง 62. A single lantern made for limelight only, however, ig generally constructed differently. The body itself is made of mahogany, and it is the lining of sheet-iron or tin which is attached to this: there is usually an all-brass front, with a