Appleton's dictionary of machines, mechanics, engine-work, and engineering : illustrated with four thousand engravings on wood ; in two volumes (1873)
D. Appleton and Company · New York : D. Appleton and Co. · leaf 616
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 ff comes into action. This is a… … 614 ENVELOP MACHINERY. I5S8. ft A* £. down at once, when they are held in the required inclined position by the atmospheric side currentsas previously detailed. The inclined projections are essentially necessary, in order that the flaps majbe folded down in their proper relative positions; the…
Mechanical engineering · Mechanics · Engineering
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