How to add sound to amateur films (1954)

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The leads from a gramophone pick-up (left) are connected to the outer tags of a volume control (centre). From the centre tag and one outer tag, leads are taken to the input sockets of an amplifier or radio set. the outer tags is also connected to the screening of the lead to the radio. The centre tag is connected to the wire running down the centre of the screened lead and going to the other socket on the radio. The resistance of the volume control may easily affect the quality of the music, making it deficient in either treble or bass. Crystal pick-ups are particularly critical in this respect. A resistance somewhere between 100,000 ohms (0-1 megohm) and 1 -0 megohm is usually required. If the music is too boomy, try a lower resistance value. If it is too thin, use a higher one. You will need this volume control to adjust the volume of the music to suit your films. Also a sudden break in the music distracts the audience, so fade the music out before removing one record and fade it in at the start of the next. 13