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1[ The reason for the increase in volume, lies in the greater surface speed at which the record runs. It is not because the record is of a larger size than the Standard Edison Record that the reproduction is louder, but because the groove cut by the recorder is somewhat longer than on the small record, and the same musical note, that is recorded on a small size record in say one revolution in seven inches of surface space, is engraved on a large cylinder (or on a small cylinder running at a higher rate of speed) in a much longer groove. This increased space allows the recording stylus to engrave the record with greater detail and minute- ness, making the undulations more gradual between the elevations and depression. In reproducing this same rec- ord, therefore, the sapphire ball follows more closely the ups and downs in the groove. There are no sharp crests or hollows as in the groove on slow speed records. The reproducer ball is a tiny little bit of sapphire 40-1000 of an inch in diameterj yet, small as is is, on a low speed record it is more likely to jump from crest to crest, thus missing the intervening hollows altogether. The New Process Edison Records are made at a very much higher rate of speed than formerly, and their tone quality and volume are almost equal to the large records. In high ipeed records the reproducer ball follows every gradual ascent and descent on the entire length of the groove, thus reproducing, minutely and completely, all the sound waves recorded at the higher rate of speed. The reproduction therefore is more complete, and the tone qualities are con- fcquently more natural and of very much greater -volume. [January Notes continued on page one twenty-six)