Illuminated indicator gauge

Details Illuminated indicator gauge Illuminated indicator gauge

1975-05-02

1977-01-25

Swisher, S. Clement

Signals and indicators

Bells

Gong type

116129P, 116DIG5, G01D 1304, G01D 1322

Patent

active

040045463

ABSTRACT:
An indicator gauge has a flat light conducting prism with an upper beveled surface positioned between the translucent dial and movement of the indicator. The prism receives light from a source located in the rear portion of the gauge and laterally of said movement, such that light is reflected downwardly by the beveled edge through the prism to illuminate the dial and pointer. A second annular prism may also be provided with a beveled surface so as to reflect light from the source across the face of the dial.

REFERENCES:
patent: 2918034 (1959-12-01), Neugass
patent: 3503365 (1970-03-01), Baez et al.
patent: 3867623 (1975-02-01), Widlund
Besancon, Robert M., The Encyclopedia of Physics, Van Nostrand Co., N.Y., pp. 494-497.

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