Patent Examiner.—One who examines and passes on patents in the patent office.
Patentee.—The one to whom a patent is granted.
Periphery.—(1) The circumference of a circle. (2) The outer surface of a wheel.
Perspective Drawing.—See [Drawing, Perspective].
Perspective, Isometric.—See [Isometric Perspective].
Philosophy.—(1) The science of all natural laws. (2) The laws, causes and principles on which facts can be explained. (See [Psychology].)
Precision.—(1) The state of being very accurate. (2) Said of any instrument or machine which works with exactness.
Principle.—A truth or cause.
Priority.—Being first.
Protractor.—An instrument for laying off and measuring angles by degrees.