The book of the lantern : being a practical guide to the working of the optical (or magic) lantern : with full and precise directions for making and coloring lantern pictures (1889)
Hepworth, Thomas Cradock, -1905 · New York : E.L. Wilson · leaf 70
48 THE BOOK OF THE LANTERN. Low Pressure Cylinders Charged to 10 Atmospheres Cub. contents. Diameter. Weight. Length. 10 ft. 10 in. 391b. 20 in. 10 „ 68 „ 36 „ u „ Each cylinder is fitted with a tap to regulate the flow of gas, which tap has a nipple over which the rubber … 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.…
Lantern projection
Internet Archive · Getty Research Institute · Public domain (published before 1931). Free to use for anything.
