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 624
nded; and to facilitate this, four projecting arms, or guides ff, are formedon the top of the platform, agreeing, as in the angle pieces of the folding box, with the angles of the flatblanks. As the blanks are fed into proper position, the folding plunger g comes into action. This is a… … 614 ENVELOP MACHINERY. down a< once, when they are held in the required inclined position by the atmospheric side ourras previously detailed The inclined projections are essentially necessary, in order that the flaps 1598. r-n ft _c i -S 1 i currents, may be folded down in their proper relative…
Mechanical engineering
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