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SOUND-ON-FILM EQUIPMENT 153
employed. This makes the instrument available for use either with sound-on-film or sound-on-disc, and we believe it is the only commercial equipment so far using substandard film which is universal to this extent.
The B.T-H. 16 mm. Sound-on-Film Reproducer. The British Thomson-Houston Co. is one of the largest British concerns manufacturing and installing professional 35 mm. sound-on-film equipment, and thus their entry into the 16 mm. sound-on-film field is particularly interesting. The film employed is of a standard type, that is to say, it possesses both sets of perforations in contradistinction to the R.C.A. set just described. An illustration of the B.T-H. 16 mm. sound film is shown in Fig. 74, where it will be noted that the variable width or variable area style of recording is adopted, but the projector will Fig. 74
function equally well with any type of sound B'T" S '
track.
As with the Radio Corporation of America, the British Thomson-Houston Co. are for the moment concentrating on reproduction equipment, and film will be reduced from standard 35 mm. or from disc if necessary. This is to say that at the time of writing at all events, no commercial effort is to be made to market sound-on-film recorders of the 16 mm. variety. The soundness of this policy has already been mentioned, even while we naturally would like to see apparatus on the market whereby the amateur could, if he wanted, make his own sound film.
The actual size of the sound track is -055 in. wide on a film 16 mm. (-63 in.). When it is considered that this is less than one-sixteenth of an inch one cannot help thinking it is remarkable that good reproduction can be obtained with such a small area to record the infinite variations of sound which occur in life.
Although the equipment has only recently been placed on the market it is the result of a number of years research. It was first shown at the Exhibition of Mechanical Aids to Learning at South Kensington in 1931, but between times various improvements have been incorporated, and the ii— (5762)