At a meeting of the Leicester Gramophone Society, Mr Arthur de Solla, an expert, gave an interesting talk on the general principle and the care of machines. He held that mica is the only substance in -which the vibrations are even over the vrhole surfaqe of the sound-box disc. The lecturer emphasised the necessity of winding up with '&« brake released, and with the aid of a model motor spring, and tone-arm in different stages of construction, made this and other points clear. He proved that the cause of ••bumping'' is in most caees to bo laid at the door of over-winding, which makes a kink ia the inner leaves of the spring, and causes this to catch the outer leaves.
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Press, Volume LXI, Issue 18368, 29 April 1925, Page 5
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120Untitled Press, Volume LXI, Issue 18368, 29 April 1925, Page 5
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