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Vertical Sound Records<!--<xref ref-type="fn" rid="fn110.5594_J05554">*</xref>-->: Recent Fundamental Advances in Mechanical Records on Wax<!--<xref ref-type="fn" rid="fn110.5594_J05554">*</xref>-->

1932; Volume: 18; Issue: 2 Linguagem: Inglês

10.5594/j05554

0097-5834

H. A. Frederick,

Tribology and Lubrication Engineering

This paper describes recent progress which has been made in laboratory studies of mechanical records of sound cut on a wax disk. Both theoretical and experimental investigations indicate that a phonograph record, cut with vertical undulations instead of the more usual lateral undulations possesses fundamental advantages. The principal improvement comes from a marked increase in the volume and frequency range over which faithful reproduction may be obtained. A higher volume level can be recorded for the same groove spacing and speed. More playing time can be provided with a given size of record and volume level since, for these conditions, both the groove spacing and speed may be reduced. Improvements in methods of processing the stampers and in the record material give a large reduction in surface noise and hence a corresponding increase in the volume range. With these improvements the frequency range which can be reproduced satisfactorily can be extended nearly an octave to 8000 to 10,000 cycles. Other improvements incidental to the improvements noted above are great improvement in the quality of reproduction obtainable directly from a soft “wax” record and a great extension in the life of the hard record.