Multiplicity

Many; numerous; a large quantity.

Mutilated

As applied to a gear, one in which certain teeth are removed.

Nautical

Marine; applied to shipping, and the like.

Neutralizes

Any substance, like a chemical, which, when added to another chemical, will change them both.

Nitro-glycerine

An explosive made from glycerine and nitrogen.

Oblique

At an angle; inclined.

Obliterate

To wipe out.

Obvious

That which can be seen; easily observed.

Obtuse

A blunt angle; not noticeable.

Odophone

An instrument for determining and testing odors.

Olfactory

The nerves of the sense of smell.

Orifice

An opening; a hole.

Oscillation

A movement to and fro, like a pendulum.

Oxygen

The most universal gas, colorless and tasteless; is called the acid-maker of the universe and unites with all known substances, producing an acid, an alkali, or a neutral compound.

Oxidizing

To impart to any substance the elements of oxygen.

Oxide

Any substance which has oxygen added to it.

Pallet

A part of a tooth or finger which acts on the teeth of a wheel.

Parallel

Lines or sides at equal distance from each other from end to end.

Paraffine

A light-colored substance, produced from refined petroleum.

Perimeter

The outer margin of a wheel; the bounding line of any figure of two dimensions.

Periphery

The outer side of a wheel.

Peen

The nailing end of a hammer.

Persistence

That quality of all matter to continue on in its present condition.

Perpendicular

A line drawn at right angles to another.

Perpetual

Without end.

Perspective

A view of an object which takes in all parts at one side.

Physically

Pertaining to the body.

Phonautograph

An apparatus for recording sound.

Phonograph

An apparatus for taking and sending forth sound vibration.

Phenomena

Any occurrence in nature out of the ordinary.

Pitman

The rod or bar which connects the piston and crank.

Pivot

A point or bar on which anything turns.

Pinion

A small toothed wheel.

Pitch

The number of vibrations. The term used to give the number of teeth in a wheel.

Pitch diameter

The point from which the measurements are made in determining the pitch.

Pivoted

A bar, lever, or other mechanical element, arranged to turn on or about a point.

Plastic

A substance in such a state that it may be kneaded or worked.

Planer

A large tool designed to cut or face off wood or metal.

Porosity

The quality in all substances to have interstices, or points of separation, between the molecules.