Motor driven metal wheel with 30 rectangular slits attached to a smaller reduced speed cog and bell on a solid cast iron base. Small plate with "W. G. PYE & Co. Cambridge, London".
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