Report of the Non-Theatrical Equipment Committee

A résumé is presented of correspondence conducted with the British Institute of Cinematography. The report of this organization is abstracted as follows: (1) A theoretical analysis of the light losses in a projector using direct illumination is made, showing that for every 100 lumens emitted by the lamp, only 2.43 lumens find their way through the projection lens; (2) it is suggested that unit intensity be used as a method of comparison between one projector and another and that 1 foot-candle be regarded as an average value for home use and 4 foot-candles for small auditoriums. — Objection is taken by this Committee to the latter proposal, and the opinion is expressed that the suggested values are too low. A satisfactory intensity should cover projection of adequate quality. — Attention of the Society is directed to the matter of standardizing the procedure for the determination of total screen lumens.

Print ISSN
Published
1937-07
Content type
Original Research
DOI
10.5594/J08513