He must also further allege that the invention was not patented or described in any printed publication here or abroad, and not manufactured more than two years prior to the application, and that he has not made an application, nor authorized any one to do so more than two years prior to his application.

The first Government fee is $15, payable at the time of filing, and the second and final fee is $20, payable at the time the patent is ordered to issue.

Practical Mechanics for Boys — Part 83

The filing of an application for patent is a secret act, and the Patent Office will not give any information to others concerning it, prior to the issue of the patent.

Practical Mechanics for Boys — Part 83

Abrupt. Suddenly; coming without warning.

Practical Mechanics for Boys — Part 83

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.

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.