The Progress of Photography Since the Year 1879 a Review of the More Important
The Progress of Photography Since the Year 1879 a Review of the More Important
Hermann Wilhelm Vogel
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Kayser has used Atwood's Gravity Machine for these calculations, with excellent success. As the machine may easily be made to give a falling body a known rate of speed (about twenty-seven inches per second), the body may be photographed and the rapidity of the shutter registered to one one-thousandth of a second. (Phot. Mitth. , xix. Juliheft ii. ) Boca's Shutter. — This invention of a Parisian has the peculiarity of permitting the exposure to be Ineasured. It has a clock movement with a hand 1...6* 186 PHOTOGRAPHIC APPARATUS. traversing the dial in three seconds. The dial is marked off in three parts, each part being subdivided into 50° of Avhich each one represents one-Hftieth of a second. The shutter itself consists of two disks rotating in their own planes b}^ a spring-motor; one opening the lens and the other closing it. The ex- posure is made by pressure on the button that starts the clock-work and the disks together, the hand on the dial pointing to 0. If exposures of the -^, ^ or ^ of a second are desired, the hand is made to point to tlie first, second, third, or fourth degree from the Ijefore starting.
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