S.L. 10.17 Art. 20Cinematograph projectors.

Cinematograph projectors shall be fitted with two metal film-boxes of substantial construction, and not more than thirty-five point five centimetres in diameter, inside measurement, and to and from these the films shall be made to travel. The film-boxes shall be made to close in such a manner, and shall be fitted with a film-slot (fissure) so constructed as to prevent the passage of flame to the interior of the box.