134. Thornton-Pickard Roller-Blind Time and Instantaneous Shutter, c. 1892
Signed on ivory disc: 'TIME & INST PATENT THORNTON-PICKARD'; serial number H 82687 stamped on base.
To set the shutter the rubberised cloth blind is wound onto a roller at the other end of the box and is released by pulling the cord when the blind rolls back rapidly uncovering a circular aperture of 40 mm diameter. Speeds 1/15-1/90 sec. Initially patented by J. Kershaw in 1885, it was improved by J. E. Thornton's patent in 1886, and sold from 1888.
Length 90 mm, width 70 mm, depth 30 mm.
Inventory no. 63,701.