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 #:
00056
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. 43 in the same manner, they will be found to be square in out- line, as in B. Should it be desired to use the manganese over again, it must be freed from the chloride by repeated FIG. 19. changes of water. It will thus be dissolved out, while the manganese remains behind in the form of black mud. This latter must be dried before being again employed in the retort. The operation of oxygen gas making is now with many lanternists a thing of the past, for they prefer to buy it ready made. For many years this gas has been supplied, by one or two makers, compressed in iron or steel cylinders. But the price, eightpence per foot, was too high to induce consumers to relinquish the custom of making it themselves. Of recent months, however, the gas has been supplied at half that price, with the result that many prefer to buy it rather than make it themselves. The manufacture of oxygen gas therefore represents "A curious new industry," and under that title I described it a