Ray Box

A ray box consisting of a rugged sheet metal box with a 12 V, 10 W festoon type axially straight filament lamp. Fitted with a cartridge for holding 4 types of slits – single, double, triple and wide slots Ideal for quick adjustment to get the desired ray/beam type Includes color filters Also included is a convex cylindrical collimating lens for adjusting the beam to obtain long clear tracks which can be parallel, converging or diverging.