Discoveries and inventions of the nineteenth century (1905)
Routledge, Robert · London : G. Routledge and Sons · leaf 531
dmits of being moved and stopped with the desired rapidity.The movement is imparted by an electric motor, and the arrangement issuch that for each exposure the film is held stationary for -^ijths of ^g-thof a second, during which the lens is uncovered, then for the remainingj\jth it is covered,… … Fig. 251a,—Jiaisoris Ktneiographic Theatre. 48o SIGHT. is at the rate of 26 miles an hour) must be small, and it is found thatphotographs about i in. in diameter cannot be much exceeded in viewof this condition. The lens has to be entirely stopped or screenedduring the tenth of the short interval…
Inventions
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