Originally Posted by
CCHarrison
Pierre Maugey was a well known lens maker in Paris and worked on a very early lens diaphragm in 1858 which he patented.
His patent read as follows:
A.D. 1858, April 22.—N" 887.
MAUGEY, Pierre.—(Partly a communication.) — " Improvements in diaphragms for optical instruments."
This invention relates to a mode of constructing diaphragms, whereby the size of the aperture may be increased or diminished, or regulated at pleasure to the greatest nicety.
This object is effected by making the diaphragm of some elastic material, which is capable of being expanded or stretched. The material which is preferred is a disc or sheet of india-rubber, either vulcanized or in its natural state, or some other analogous elastic material. A small central circular opening is made in this disc, the edges of which are securely held or clamped, and by forcing the disc outwards by " means of any convenient instrument, so as to stretch the material, the central opening or aperture made therein will " be expanded ; or by drawing back the stretching instrument the aperture will be contracted.
The stretching instrument may be actuated by means of a rack and pinion motion, which is the most convenient contrivance for the purpose, but other means may be employed for effecting the object, if preferred."
Dan
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