The book of lantern ; being a practical guide to the working of the optical (1888)

Record Details:

Title:
The book of lantern ; being a practical guide to the working of the optical
Date:
1888
Publisher:
London : Wyman & Sons
Volume:
The book of lantern ; being a practical guide to the working of the optical (or magic) lantern ; with full and precise directions for making and colouring lantern pictures
Leaf #:
00082
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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THE BOOK OF THE LANTERN. is shown at fig. 29. A is the loose nut by which it is attached to the gas-bottle; B, the valve proper, which is governed by the spring lever D. The tendency of this spring is to keep the bag shut, and when in that position the tap is open. The gas pressure, however, quickly inflates the bag, and turns off the gas supply. The delivery pipe, E, is connected with the lantern. The. apparatus is small and com- pact, and works well. It may be noted here, that there is a distinct gain in using pure hydrogen, instead of the carbureted gas from the main, although its employment undoubtedly leads to extra trouble and ex- pense. The most convenient way of making this gas in small quantities is by treating scrap zinc with dilute acid. A con- venient apparatus is that shown in the diagram, fig. 30. It was devised some years ago by Mr. Pumphrey, and published in one of the Photographic Annuals. It consists of a copper container, in which is an inverted box with a delivery tube and tap attached to it for drawing off the gas as it is generated. This inner box Fig. 30.