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Wilson, Joseph M. (ed.) / The Masterpieces of the Centennial International Exhibition illustrated: history, mechanics, science
([1876-78])
Wilson, Joseph M.
Mechanics and science, pp. [1]-375 ff.
Page 21
AMECHANICS AND SCIENCE. allow any variation and adjustment of throw and amount of feed that may be desired to be made during the cutting stroke of the machine. The crank-plate Planing-Machine. Fig. 3. Plan. is alternately moved a half revolution and disengaged in either direction at each reversion of the stroke of the tool by means of an ingeniously contrived double pawl and ratchet-wheel, receiving motion from a pinion on the front end of the 21
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