The Dictionary Of Photography

A True Historic Record Of The Art & Practice Of Photography 100 Years Ago.

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Shutters, Instantaneous
(Cl. II., a 7) The Blind Pattern. This is again a very favourite form, and one which, acting on the prin-ciple of the simple drop-shutter, gives a fair range of speed. It consists of a blind of opaque cloth fastened at each end to rollers, the lower one being pro-vided with a coiled spring, the upper with a small milled head for winding up the material, which, on the release of a catch, passes in front of the lens, exposing the plate and again covering the lens.
(Cl. II., a 8) Shutters opening from Centre. The form of opening takes various shapes, from the long straight narrow strip - the eyelid, and the diamond. The first form of opening is given by two roller blinds opening from the centre and closing again to the centre. In the second form, the aperture takes first the shape of an eyelid, and opening from, and closing to, the centre. In the third form the aperture takes the form of a diamond, opening from, and closing to, the centre.
(Cl. II., a 9) The Ever-Set Shutter. This shutter is of French origin, but is now made by many English firms.
(Cl. II., b) Shutters Working behind the Lens. There are few shutters on the market specially constructed to work in this position, though many of those working in front of the lens can be thus used, especially the blind pattern.