PLUMB n.
mb line, below. Plumb bob. See Bob, 4. -- Plumb joint, in sheet-metal work, a lap joint, fastened by solder. -- Plumb level. See under Level. -- Plumb line. (a) The cord by which a plumb bob is suspended; a plummet. (b) A line directed to the center of gravity of the earth. -- Plumb rule, a narrow board with a plum…
POLE n.
a lathe, in which the work is turned by means of a cord passing around it, one end being fastened to the treadle, and the other to an elastic pole above. -- Pole mast (Naut.), a mast formed from a single piece or from a single tree. -- Pole of a lens (Opt.), the point where the principal axis meets the surface. --…
POST n.
See under Knight. -- Post hanger (Mach.), a bearing for a revolving shaft, adapted to be fastened to a post. -- Post hole, a hole in the ground to set the foot of a post in. -- Post mill, a form of windmill so constructed that the whole fabric rests on a vertical axis firmly fastened to the ground, and capable of be…