Black finish metal box, with 12 V 24 W 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 enamelled
steel body has slots to support a cylindrical lens and a triple
slit screen Extra slots are provide for filters.Dimensions
182 x 61 x 115 mm.The box is supplied complete with lamp and
triple slit but without lenses or filters.