Comprising 8 cardboard boxes 150 x 100 x 100 mm each with hole, screen and lid, 50 sheets black paper 200 x 250 mm, one lamp, mounted on bulb holder with flexible wires and one packet of pins.
Brass dial head 40 mm diameter divided and marked in 100 divisions, vertical scale 10-0-10 mm, fitted on heavy brass disc, with 3 pointed legs, distance between legs 40 mm.
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