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Of or pertaining to the perimeter, or to perimetry; as, a perimetric chart of the eye.

The art of using the perimeter; measurement of the field of vision.

A combining form from Gr. fw^s, fwto`s, light; as, photography, phototype, photometer.

An electrometer registering by photography.

Of or pertaining to photometry, or to a photometer.

istance which bears the same relation to the pitch proper, or circular pitch, that the diameter of a circle bears to its circumference; it is sometimes described by the number expressing the quotient obtained by dividing the number of teeth in a wheel by the diameter of its pitch circle in inches; as, 4 pitch, 8 pitch,…

poids, and the calvaria of the skull, indicating a brain capacity of about 900 cubic centimeters, and resembling in form that of the Neanderthal man. Also [pl. -thropi],

r water, and observing the height to which the fluid rises in the tube; a kind of current meter.

Of or pertaining to a pluviometer; determined by a pluviometer.

hine worked by compressed air. -- Pneumatic pile, a tubular pile or cylinder of large diameter sunk by atmospheric pressure. -- Pneumatic pump, an air-exhausting or forcing pump. -- Pneumatic railway. See Atmospheric railway, under Atmospheric. -- Pneumatic syringe, a stout tube closed at one end, and provided with…

istant from every part of the circumference of a great circle; or the point in which a diameter of the sphere perpendicular to the plane of such circle meets the surface. Such a point is called the pole of that circle; as, the pole of the horizon; the pole of the ecliptic; the pole of a given meridian.…

A plane figure having many angles, and consequently many sides; esp., one whose perimeter consists of more than four sides; any figure having many angles. Polygon of forces (Mech.), a polygonal figure, the sides of which, taken successively, represent, in length and direction, several forces acting simultaneously upon…

A unit of power, being the power obtained from an expenditure of one hundred kilogram-meters of energy per second. One poncelet equals g watts, when g is the value of the acceleration of gravity in centimeters.

movements. -- Position finder (Mil.), a range finder. See under Range. -- Position micrometer, a micrometer applied to the tube of an astronomical telescope for measuring angles of position in the field of view. -- Single position (Arith.), the method of solving problems, in which the result obtained by operating wi…

tch of powder-down feathers. -- Powder hose, a tube of strong linen, about an inch in diameter, filled with powder and used in firing mines. Farrow. -- Powder hoy (Naut.), a vessel specially fitted to carry powder for the supply of war ships. They are usually painted red and carry a red flag. -- Powder magazine, or…

sually in the microscope, the number of times it multiplies, or augments, the apparent diameter of an object; sometimes, in microscopes, the number of times it multiplies the apparent surface.

around a point. Rankine. -- Pressure gauge, a gauge for indicating fluid pressure; a manometer.

Wires leading from various points of an electric system to a central station, where a voltmeter indicates the potential of the system at those points.

A species of hexameter verse so constructed as to be divisible into two portions of three feet each, having generally a trochee in the first and the fourth foot, and an amphimacer in the third; -- applied also to a regular hexameter verse when so constructed as to be divisible into two portions of three feet each. Andr…

A hymn with no regular meter, sometimes introduced into the Mass. See Sequence.