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DEFINITIONS 683
Over-Shooting
When by reason of insufficient tension the film at a projector aperture moves too far, it is said to be "overshooting."
Panel Board
Name applied to a small distributing switchboard.
Parallel or Multiple Connection
The two terms mean the same thing. It means so connecting two or more equipments that in a direct current circuit, all positive poles are connected to the positive side and all negative poles to the negative side, or in an a.c. circuit, so connecting them that one circuit wire connects to one side of all the equipment and the other wire to the other side of all equipment. This applies to generators, motors and rheostats. In fact to any equipment. By such a connection the full amperage output of each such equipment is delivered to the circuit being supplied.
Perforations
Holes on either side of the film with which the sprocket teeth engage to impart motion to the film. There are eight to each frame — four on either side.
Permeability
(a) Susceptability of a substance, usually iron, to magnetization, (b) Ratio between number of lines of force per unit area passing through a substance that can be magnetized and the force that produces the said lines, (c) Ease with which magnetic lines of force penetrate or pass through any substance. Permeability of good, soft iron is approximately 3000 times that of air, though it may vary widely according to conditions in both mediums.
Perpendicular
In optics, at right angles to any given line or plane.