RAY BOX A ray box consisting of a rugged sheet metal box with a 12V, 10W 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 colour 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.
