light interrupter

ABDNP:200712a

2 glass disks (1 large, 1 small) with darkened stripes to create a slit effect, able to rotate on metal handle with turning handle and pulley cable spindle. On wooden protective slip. Gives interrupted patterns of light

1800

diam.s (disks) 152mm and 127mm, thickness 2mm, length (handle) 290mm
box: height 18mm, length 180mm, width 180mm

glass, metal, wood

Unknown