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.

References:
 

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