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 576
all modern planing machines the cutting tool is hung to what is called an apron, so adjusted as to allowthe tool to swing loose on the back stroke of the planer-table, but to be held rigidly when cutting.In large planes, when the weight of the tool is great, and in all fine planing, this liberation… … 552 PLANING MACHINES, METAL. 3413.
Mechanical engineering -- Dictionaries
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