132. Sands & Hunter Two-bladed Go and Return Shutter, c. 1881
Signed: 'SANDS & HUNTER Patent 20 Cranbourn St, London 1036'.
Mechanism similar to previous pattern, except that the wheel drives two slides with V-shaped ends in opposite directions; spring tension set by rotating knob numbered 0 to 7. When shutter was released the blades opened up to selected aperture size and then closed again, set by scale marked 0 to 256. To be fitted behind lens with 55 mm barrel. This improvement of Michael Norton's shutter of 1879 was patented by C. Sands in 1881.
Length 260 mm, width 80 mm, depth 20 mm.
Inventory no. 89,144.