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820 GLOSSARY OF TECHNICAL TERMS [J. S. M. P. E.
Amplification, current. — The ratio of the alternating current produced in the output circuit of an amplifier to the alternating current supplied to the input circuit.
Amplification, voltage. — The ratio of the alternating voltage produced at the output terminals of an amplifier to the alternating voltage impressed at the input terminals.
Amplification, power. — The ratio of the a-c. power produced in the output circuit of an amplifier to the a-c. power supplied to the input circuit.
Amplification factor. — The ratio of the change of plate voltage of an electron tube to the change of grid voltage in the opposite direction, determined under the condition that the plate current remains unchanged. In exact usage, the term applies only when the changes in the potentials are infinitesimal.
Amplitude. — The maximum instantaneous value which any variable may attain when varying according to a periodic law; as applied to a-c. circuits, the maximum value which the current or voltage may attain during either half of the cycle.
Angle of incidence. — The angle that a ray of light incident upon a a surface forms with the normal to the surface.
Angle of reflection. — The angle that a ray of light reflected from a surface forms with the normal to the surface. This angle is equal in magnitude to the angle of incidence.
Aperture. — The opening in the aperture plate of a camera, projector, recorder, or printer at which (a) each individual picture or (b) the sound track is situated during exposure, printing, or projecting. (See also Effective aperture and Relative aperture.)
Aperture plate. — In a camera, recorder, printer, or projector, a metal plate containing an aperture.
Arc (electric). — A bridge or column of incandescent vapor which carries an electric current that sustains this condition.
A spheric. — In general, non-spherical. In optics, usually applied to surfaces of revolution generated by the rotation of a curve other than a circle.
Astrogamma. — The slope of the linear portion of the curve that shows the relation between the diameter of the image of a point source of light, and the common logarithm of the exposure.
Attenuation equalizer. — A device for altering the transmission characteristics of a circuit at various frequencies in order to obtain a