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 #:
00061
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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48 THE BOOK OP THE LANTERN. Low PRESSURE CYLINDERS CHARGED TO 10 ATMOSPHERES. Each cylinder is fitted with a tap to regulate the flow of gas, which tap has a nipple over which the rubber tubing can readily be drawn. The advantage of using a bottle instead of a bag in the one point of bulk is re- markable, as may be seen by the above table. Thus, six cubic feet, which will be sufficient for an hour and a half's entertainment, is contained in a re- ceptacle about the size of a champagne bottle, and which can be placed in the empty lantern-box during use. The amount of gas in a bottle can be readily ascertained by the use of a proper pressure gauge. In fig. 20 one of these cylinders is shown with the regulator and pressure gauge attached. The latter is of the form commonly used on steam engines, and is known as Bourdon's pressure gauge. It depends for its efficiency on the action of internal pressure upon a curved tube of oval section. The greater the pressure the straighter the tube becomes, and this movement is communicated by simple gearing to the index-finger. The following table will be found useful to those who employ compressed gas :— Fig. 20.