Bausch & Lomb Optical Co. (Rochester, NY)

Iris Diaphragm Shutter, Transitional (with pneumatic release) 1888-type, Brass - c. 1890

 

The International Annual Anthony's Photographic Bulletin, Vol. III, 1890-1891, W. J. Harrison and A. H. Elliot, eds., E. & H. T. Anthony & Co. (New York, NY), ads p. 95


Notes:  Like the 1888 model Iris Diaphragm Shutter, this shutter has the top pneumatic tube that regulates the length of exposure.  However, it has the pneumatic shutter release (the vertical, Ni-plated tube) of the 1891 model.  The advertisement engraving above, from 1890, would seem to represent this shutter, in that it has a pneumatic shutter release.  Obviously, the artist did not have the actual shutter to view while drawing it, since the pneumatic tube for the shutter release is drawn on the wrong side of the shutter, and the horizontal pneumatic tube that regulates the duration of exposure is missing entirely.

References:
The International Annual Anthony's Photographic Bulletin, Vol. III, 1890-1891, W. J. Harrison and A. H. Elliot, eds., E. & H. T. Anthony & Co. (New York, NY), ads p. 95
 

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