Appletons' cyclopaedia of applied mechanics: a dictionary of mechanical engineering and the mechanical arts (1880)
D. Appleton and Company, Benjamin, Park, 1849-1922 · New York, D. Appleton · leaf 120
.2315. … the centre to receive a hat-block ofthe desired size and shape. Anoth-er plate is suspended by rois fromthe upper cross-piece. When thetreadle is depressed, and the slidingspindle with the brim-plate raised,the hat-brim is clamped and heldfast between the two plates. Thedriving-shaft gives a…
Mechanical engineering -- Dictionaries
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