Accession Number:

AD0787121

Title:

Candlepower Measurements of C-2R and C-2V Filaments in a Directional Drum Lens,

Descriptive Note:

Corporate Author:

COAST GUARD BALTIMORE MD FIELD TESTING AND DEVELOPMENT CENTER

Personal Author(s):

Report Date:

1956-11-14

Pagination or Media Count:

31.0

Abstract:

Lamps customarily used in 200MM drum lenses are of the C-8 type which has a straight coiled filament. This filament has also been used in hot spot or directional drum lenses. It was believed that the assymmetry of illumination from electric filaments of the C-2R and C-2V types roughly V shaped coils would permit more efficient use of the luminous output of the filaments, when used in a directional drum lens. The tests conducted under this project show that the efficiency of operation of a 200MM Corning directional drum lens measured in terms of the beam candlepower per watt of electrical power input definitely indicates that the C-8 filament provides a more efficient illumination pattern than either the C-2R or C-2V type filaments. Modified author abstract

Subject Categories:

  • Marine Engineering

Distribution Statement:

APPROVED FOR PUBLIC RELEASE