Description
Robust metal box containing 12V 18W line-filament bulb, the position of which can be varied. 4mm plugs are provided for connection to a low-voltage electrical supply. Single slit and plastic piano-convex lens are both provided to focus the light from the bulb. Accessories included are Set of 7 Plastic Mounted Filters, 1 Tricolour Filter, Plates containing 2 Narrow Slits, 3 Narrow Slits and 1 Broad Slit.