Pivot. A fixed pin, or short axis, on the end of which a wheel or other body turns.
Pitch. Slope; descent; declivity, like the slope of a roof.
Placement. The act of placing; in the state of being placed.
Predominate. To be superior in number, strength, influence or authority; controlling.
Produced. To lengthen out; to extend.
Prototype. The original; that from which later forms sprang.
Purlin. A longitudinal piece of timber, under a roof, mid-*way between the eaves and comb, to hold the rafters.
Rabbeting. The manner of cutting grooves or recesses.
Ratchet. A wheel, bar, or other form of member, having teeth or recesses.
Rebate. A rectangular, longitudinal recess or groove, cut in the corner or edge of a body.