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 #:
00093
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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80 THE BOOK OF THE LANTERN. each lantern alternately has the great merit of saving nearly half the gas bill. It will be noticed in the cut of the dissolving tap that it is furnished with two small stop cocks, which are fixed on vertical tubes near its centre. These tubes are by-passes which allow a small quantity of gas to pass to each burner, although the lever has shut off the main supply. The necessity for this arrange- ment is obvious; without it the lantern not in actual use would be totally extinguished. In using the blow-through form of jet :both by-passes, must be employed, but with the ;mixed jet the hydrogen by-pass only is necessary. The first thing to be done in operating with a double lantern is to light the hydrogen in both lanterns, and to so adjust the by-pass that it will admit just enough gas to the lantern not in use to give a flame about half an inch high. When the blow-through jet is used the correspond- ing oxygen tap must be manipulated to furnish just enough of that gas to tinge the hydrogen flame. If this precaution