Appleton's dictionary of machines, mechanics, engine-work, and engineering (1861)
Appleton, firm, publishers, New York. (1852, D. Appleton & Co.) · New York : D. Appleton · leaf 229
pair of shears along this mark, divides each turn ofthe coil into two perfect button shanks or eyes. Hardings Improvements.—These improvements in the manufacture of buttons«and other dress fasten-ings, consist in the arrangement and construction of the parts whereby they are secured to the dress,… … CALCULATING MACHINES. 223 through the garment, is turned at right angles, and coiled in the form of a spiral in a plane parallel tothat of the hutton. The spiral consists simply of about two turns, and terminates abruptly. ^ On se-curing this button to the garment, the end of the spiral is inserted…
Mechanical engineering
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