WONDERFUL SCREWS.
*«e smallest screws made are those used « *«*h factories. They are cut from steel we by a machine. The fourth jewel screw * * wrtoh is all but inviiibls to the naked
eye. Tho magnifying glass,however, reveals a screw with 250 threads to the inch. Such a screw is 4-1000ths of an inch iv diameter, and the heads ore double the size of the hoSlSo,(so n o o flbem y ™ nan ' a thi ™ bl « *•--
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Bibliographic details
Press, Volume LIII, Issue 9305, 4 January 1896, Page 7
Word Count
74WONDERFUL SCREWS. Press, Volume LIII, Issue 9305, 4 January 1896, Page 7
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