Another peculiarly effective form of shutter is that known as THE PROSCH ECLIPSE SHUTTER, which is a small and compact instrument, made of metal and rubber, by which an exposure of 1⁄200 part of a second may be made, with the power of reducing the speed to about one-half second.
THE PROSCH ECLIPSE SHUTTER
A late and decided improvement on the Eclipse Shutter has been produced by Mr. Prosch, which he has named the "Duplex."
Prosch's Duplex Shutter is intended both for "timed" and instantaneous exposures.
It is equal to any requirement for the most rapid work, and as a time shutter, exposures can be made of from one-half second to any duration required.
The peculiarity of this shutter is that the exposing slides are placed between the front and back combinations of the lens, necessitating a separation of the tube at the centre. p167
Mr. Prosch makes a special tube to which is affixed the apparatus of the shutter. This special tube is of the exact size of that to which the lenses belong, from which the lenses are taken and fitted to the special tube. The other is kept for future use if necessary.