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 #:
00063
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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CHAPTER IV. LIME-LIGHT JETS, BAGS, PRESSURE BOARDS, ETC. HEBE are three forms of jets for the lime-light, namely, the oxycalcium, the blow-through, or safety form, and the mixed jet. The simplest of all is the first named. The oxy calcium jet consists of a spirit-lamp, which is fed from a little reservoir at the back of the lantern. The spirit furnishes the necessary hydrogen, and through its flame a jet of oxygen is passed, and impinges upon a cylinder of lime placed just at the other side of the wick. This lamp will well illuminate a disc of about ten feet in diameter with a clear, white light. It has the advantage of simplicity, but presents one difficulty in the circum- stance that the lantern must be kept perfectly level. If it is inclined backwards, the spirit cannot flow to the point of combustion, and if it -is inclined forwards the fluid may flow too rapidly towards the wick. In some forms of oxycalcium lamp this is obviated by a special construction of the spirit cistern, which is furnished with an automatic valve for governing the supply of fluid to the wick. The wick will rapidly become charred if the stream of oxygen