PENGUIN n.
uin) of the Pineapple family; also, the plant itself, which has rigid, pointed, and spiny-toothed leaves, and is used for hedges. [Written also pinguin.] Arctic penguin (Zoöl.), the great auk. See Auk.
PITCH n.
ing with a sprocket wheel. -- Pitch line, or Pitch circle (Gearing), an ideal line, in a toothed gear or rack, bearing such a relation to a corresponding line in another gear, with which the former works, that the two lines will have a common velocity as in rolling contact; it usually cuts the teeth at about the middl…
RACK n.
ld tight by the use of a small stick of wood twisted around. -- Rack rail (Railroads), a toothed rack, laid as a rail, to afford a hold for teeth on the driving wheel of locomotive for climbing steep gradients, as in ascending a mountain. -- Rack saw, a saw having wide teeth. -- Rack stick, the stick used in a rack…