C. E. Hopkins
The Pneumo Lens-Mounted Brass Shutter - c. 1892
No. 3 (3" diameter)
No. 4 (4" diameter)
Notes: This
shutter, formerly described as unknown on this page, has been identified
as a Hopkins Shutter, which was patented by L. Prosch in 1891, and
subsequently marketed by C. E. Hopkins as The Pneumo Shutter.
The two examples above have their pneumatic tube (to which to attach the
bulb and hose) on the different and opposite sides of the shutter.
The upper example matches the layout of the patent drawing below.
References:
Catalogue "G" 1898 Photographic Apparatus and Materials,
Montgomery Ward & Co. (Chicago, IL), p.33
