Abrupt

Suddenly; coming without warning.

Abrasive

A material which wears away.

Actuate

Influenced, as by sudden motive; incited to action.

Accumulate

To bring together; to amass; to collect.

Acoustics

The branch of physics which treats of sound.

Adhesion

To hold together; a molecular force by means of which particles stick together.

Affinity

Any natural drawing together; the property or force in chemicals to move toward each other.

Aggravate

To incite; to make worse or more burdensome.

Alloy

A combination of two or more metals.

Altitude

Height; a vertical distance above any point.

Alkali

Any substance which will neutralize an acid, as lime, magnesia, and the like.

Amalgam

Any compound of metal which has mercury as one of the elements.

Amiss

Wrong, fault, misdeed.

Annealing

A process of gradually heating and cooling metals, whereby hardness and toughness are brought about.

Angle plate

A metal structure which has two bodies, or limbs, at right angles to each other.

Analysis

The separating of substances into their elementary forms.

Anchor bolt

A structure intended to be placed in a hole in a wall, and held there by a brew which expands a part of the structure.

Apprentice

One who is learning a trade or occupation.

Artificial

That which resembles the original; made in imitation of.

Arbor

A shaft, spindle, mandrel, or axle.

Armature

A metallic body within the magnetic field of a magnet.

Arbitrary

Stubborn determination. Doing a thing without regard to consequences.

Artisan

One skilled in any mechanical art.

Attributable

That which belongs to or is associated with.

Automatically

Operating by its own structure, or without outside aid.

Augmented

Added to; to increase.

Auxiliary

To aid; giving or furnishing aid.

Avoirdupois

The system of weights, of which the unit is sixteen ounces.

Back-saw

A saw which has a rib at its upper margin.

Barleycorn

A grain of barley.

Bastard

A coarse-grained file.

B. T. U

British Thermal Unit.

Back-gear

That gear on a lathe for changing the feed.

Bevel

Not in a right line; slanting; oblique.

Bibb

A form of water faucet.

Bit, or bitt

A form of tool for cutting purposes on a lathe, planer, shaper, or drilling machine.

Borax

A white crystalline compound, of a sweetish taste. Chemically it is sodium biborate.

Buffs

Usually a wheel covered with leather or cloth, and having emery dust on it, for fine polishing purposes.