■ The bearings of a modern bicycle contain about 250 balls. These cost well under a shilling, yet every ball is a true sphere of correct diameter within one ten-thousandth of an inch.
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Manawatu Times, Volume LIV, Issue 6865, 21 March 1929, Page 11
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32Untitled Manawatu Times, Volume LIV, Issue 6865, 21 March 1929, Page 11
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