Optic projection : principles, installation and use of the magic lantern, projection microscope, reflecting lantern, moving picture machine, fully illustrated with plates and with over 400 text-figures (1914)

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146 HELIOSTATS FOR THE MAGIC LANTERN [Ca. VI FIG. 77. ONE-MIRROR HELIOSTAT OF S'GRAVESANDE. (From his: Elementa Mathematica Phy sices, Tomus II, Tabula LXXXIII). This picture is a facsimile except that the clock-shaft has been extended above and below. B B Base of the mirror support with leveling screws. P Hollow cylinder in which the mirror support C can rotate. C The pillar with mirror fork at the upper end. 5 Plane mirror. D K Shaft at right angles to the mirror and extending to the fork at the end of the clock-hand (N 0). L L M Foot of the support for the clock-work. Ill The leveling screws of the support.