Black finish metal box, with 12V 24W straight filament lamp. The lampholder, with 1m of twin flex, is mounted in sliding metal bridge-piece which provides sufficient adjustment to produce covering, parallel or diverging rays. The enameled steelbody has slots to support a cylindrical lens and a triple slit screen. Extra slots are provided for filters.
Dimensions: 182 x 61 x 105mm.
The box is supplied complete with lamp and triple slit but without lenses or filters.