LENSES
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The Lenses used in Crouse-Hinds signals were made by either Corning Glass or KOPP Glass. They conformed in transmission and chromaticity to the specifications of the Institute of Traffic Engineers ( ITE ). 8 3/8" diameter and 12" diameter lenses were used. The outer surface of the lens is smooth, making cleaning easy. The inner surface contains the prisms for directing the light. Each lens was designed for its particular purpose. Only the finest optical glass, true to color and of high transmission was used. They were thoroughly annealed and tested before shipment, and were fully guaranteed against breakage due to heat of the lamp. |
| LETTERED PRISMATIC DIFFUSING LENSES Made by Corning Glass The lettered prismatic diffusing lens was used as a standard lens in all Crouse-Hinds signals from 1922 to 1927. These lenses were available well into the 1950's, and were substituted for the standard lens when requested. The lettering was molded in the glass and the letters were painted black. This lens has a shorter range than the type B or T lens, but gives a somewhat wider angle of light distibution. Due to the wide use of traffic signals, the words "STOP", "CAUTION" AND "GO" became unnecessary. Available in 8 3/8" red ( STOP ), amber ( CAUTION ), and green ( GO ). |
| PRISMATIC DIFFUSING LENS Made by Corning Glass The prismatic diffusing lens was used as a standard in all Crouse-Hinds signals from 1922 to 1927. These lenses were available well into the 1950's, and were substituted for the standard lens when requested. This lens has a shorter range than the type B or T lens, but gives a somewhat wider angle of light distibution. Available in 8 3/8" red, amber, green and clear ( for bottom lights ). |
| TYPE T COMBINATION LENS Made by Corning Glass The type T combination lens came out around 1940 and was designed to meet the candlepower distribution requirements of the new specifications of the Institute of Traffic Engineers. This lens when used with the Crouse-Hinds parabolic glass reflector exceeded the candlepower requirements of the specifications. This lens has a combination of directing and diffusing prisms which direct the light slightly downward and to the sides and gives a very high candlepower in the center of the beam. This provided a bright and positive signal indication under all conditions. The lower portion of the lens has a special crescent-shaped set of prisms, which distributes light downward and to the sides, for pedestrians and nearby vehicle drivers, regardless of the angle from which it is seen. This lens was a standard lens for the DT signals. Available in 8 3/8" red, amber and green. |
| TYPE B COMBINATION LENS Made by Corning Glass The type B combination lens was furnished as standard in all Crouse-Hinds signals from 1927 to 1940. At some points it fell short of the ITE candlepower requirements. This lens has a combination of directing and diffusing prisms which direct the light slightly downward and to the sides. The lower portion of the lens has a special crescent-shaped set of prisms, which distributes light downward and to the sides, for pedestrians and nearby vehicle drivers, regardless of the angle from which it is seen. The type B lens was used in type T and early D signals. The type B lens was later available as a substitute lens. Available in 8 3/8" red, amber and green. |
PEDESTRIAN LENSES Made by KOPP Glass ARROW LENSES Made By KOPP Glass |
| MORE INFORMATION WILL BE ADDED SOON. |