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MANAGERS AND PROJECTIONISTS 43
SCREEN, SEMI-REFLECTING.— A term commonly used to describe metallic and other brilliant surface screens, which to greater or less extent give both diffuse and regular reflection.
SCREEN, DIFFUSING.— A screen which has high powers of diffusion of light.
SCREEN, CALSOMINED.— A backing of suitable material, usually plaster or cloth, which is coated with calsomine. See page 229.
SCREEN, PAINTED.— A backing of suitable material the surface of which is painted, either with a mixture of white lead and zinc, or white zinc, mixed flat. See page 227.
SCREEN BORDER.— A border of flat black or other dark color surrounding the picture, for which it serves as an outline. See page 240.
SCREEN BRILLIANCY.— The apparent brilliancy of the screen surface as viewed from the auditorium; also the degree of brilliancy per unit of area of the screen surface as shown by photometer measurements.
SCREEN SETTING.— The immediate surrounding of the screen.
SECONDARY COIL.— In a transformer, a coil of insulated wire in which the secondary current is induced. See "Primary Coil."
SECONDARY CURRENT.— The current induced in the secondary coil of a transformer. The current delivered to a projection lamp by an Economizer, Inductor or Compensarc.
SECONDARY E. M. F.— The voltage of the current induced in the secondary coil of a transformer.
SELF CONTAINED.— A term employed to describe a machine the essential parts of which are all contained in one frame, or in one foundation.
SELF OILING BEARINGS.— Machine bearings which are oiled automatically by the operation of the machine itself, the oil usually being contained in an oil well or reservoir located beneath the bearing, from which it is delivered to the bearing by suitable means. See "Ring Oiling."
SERIES. — As applies to electrical machines, lamps or devices, a connection in such way that the current must pass through two or more of them in succession in its passage from positive to negative.
SERIES WOUND DYNAMO.— A dynamo in which the field magnets are wound with a few turns of heavy wire which is in