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The scope base is the attachment interface on the rifle's receiver, onto which the scope rings or scope mount are fixed. Early telescopic sights almost all have the rings that are fastened directly into tapped screw holes on the receiver, hence having no additional scope base other than the receiver top itself.
Rear, rotating diopter drum sight of a SIG SG 550 service rifle.The viewing aperture above the "3" (denoting the 300 m setting) can be seen. The diopter is in principle a vertically and horizontally (elevation and windage) adjustable occluder with a small hole (aperture), and is placed close in front of the shooter's aiming eye.
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An 1899 trade advertisement Mutoscope at Herne Bay Museum Mutoscope in San Francisco antique arcade Mutoscope: "Mechanical Maniacs" video.. The Mutoscope is an early motion picture device, invented by W. K. L. Dickson and Herman Casler [1] and granted U.S. patent 549309A to Herman Casler on November 5, 1895. [2]