=Measuring-machine.= A machine for determining the measurement of a piece.

=Micrometer.= (m[=i]-kr[)o]m'e-ter). A tool for measuring to minute fractions of an inch.

=Mill-file.= A single cut file used for filing sheet steel, saw teeth, etc.

=Milling-cutter= _or_ =mill.= The cutter or cutting tool used in a milling-machine.

=Milling-machine.= A machine in which revolving cutters are used to dress the surfaces of metal and cut them to size and shape.

=Mitre-cutting machine.= A machine for cutting mitre joints.

=Mitre-joint.= A joint at an angle of 45 degrees to the plane of the pieces it joins.

=Mitre-wheel.= A bevel gear having its teeth at an angle of 45 degrees to its shaft.

=Mortise.= A recess slot usually square or rectangular, and employed to receive a tenon from another piece.

=Moulding-cutters.= The cutters employed to produce mouldings on wood.

=Multiple-drilling machine.= A drilling-machine in which more than one drilling-tool may be used, and separate and successive operations may be performed upon the work, carrying it from one drill-spindle to another.

=Mute-pulley.= A belt-guiding pulley that can be adjusted to various positions upon its stand.

N

=Nail-bit.= A boring tool for wood, used for cutting across the grain of wood.

=Nut.= A threaded piece for receiving a screw.

O

=Odontograph= ([=o]-d[)o]n'-to-gr[)a]f). An instrument employed in making or drawing gear-wheel teeth.

=Oliver.= A foot-power hammer used by blacksmiths, mainly for forging bolts or studs.

=Outside-calipers.= Calipers used to measure external surfaces.

P

=Panelling-machine.= A machine for cutting mouldings upon panels.

=Parallel-file.= A file whose thickness is equal from end to end.

=Parallel-vise.= A vise in which the gripping face of the movable jaw is maintained parallel to that of the fixed jaw.

=Paring-chisel.= A wood-worker's chisel that is pushed to its cut by hand pressure.

=Pattern-lathe.= A lathe designed for the use of pattern-makers.

=Pawl.= A tongue that engages with a ratchet.

=Pene= (p[=e]n) _or_ =pane.= The lightest end of a hammer.

=Pening= (p[=e]n'ing). The hammering of the surface of metal in order to stretch it and alter the shape of the piece.

=Pillow-block=, =pillar-block= _or_ =plumber-block.= A piece that affords a bearing for a shaft and is bolted to a pillar or frame.

=Pin-block.= A wooden block used to steady small pins when filed in the vise.

=Pinion.= The smallest wheel in a pair of wheels or in a train of gearing.

=Pin-wrench.= A wrench having a pin to enter holes in the nut.

=Pipe-cutter.= A hand tool for cutting pipe into lengths.

=Pipe-die.= A tool for cutting threads on pipes.

=Pipe-tongs.= A hand tool for gripping pipes.

=Piston.= 1. That part of a steam-engine that moves under steam pressure. 2. A disc that fits a bore and slides therein.

=Pitch.= The distance apart of two pieces.

=Pitch-circle.= A circle drawn through these parts in a gear wheel where the face of the tooth meets the flank, this circle representing the diameter of the wheel for calculations involving its velocity.

=Pitch-line.= A part of a pitch circle.

=Pitman.= A name sometimes given to a connecting rod.

=Planer-shaper.= A metal-cutting machine in which the ram or slide carrying the tool is moved after the manner of a planing machine.

=Planimeter= (pla-n[)i]m'-e-ter). An instrument for finding the area of irregularly shaped plane surfaces.

=Planing-machine.= 1. For iron. A machine having a travelling work-table sliding in guideways, the tool being carried in a slideway that spans the table, two or more slide-rests are used in the larger-sized machines. 2. Wood-planing machine. A machine in which the work is fed to a revolving shaft or head carrying long planing knives.

=Platen.= 1. A work-holding table. 2. The plane surfaced plate which presses on the type in printing.

=Play.= Looseness of fit.

=Plug.= The interior piece of a c.o.c.k.

=Plug-and-collar gauge.= A pair of gauges for the same size, the plug being sometimes termed the male and the collar the female gauge.

=Plug-tap.= A tap that follows the taper taps and has but two or three of its teeth eased off at the end.