Accession Number:

AD0787116

Title:

Effect of Filament Length on Performance of Drum Lenses,

Descriptive Note:

Corporate Author:

COAST GUARD BALTIMORE MD FIELD TESTING AND DEVELOPMENT CENTER

Personal Author(s):

Report Date:

1957-10-02

Pagination or Media Count:

18.0

Abstract:

The peak beam candlepower of a lens-lamp combination depends upon the size and shape of the lamp filament. This relationship can be stated in terms of the variation of lens-to-lamp candlepower ratio with lamp filament length. Previous tests showed that the lens-to-lamp ratio increases with decreasing filament length. These previous tests were made with filaments having lengths from about 6 millimeters to 3.6 millimeters. In this report, measurements of lens to lamp ratios are presented for filaments having lengths of from 6 millimeters to 2.5 millimeters. These measurements are given for a 200 millimeter pressed glass drum lens, 300 millimeter pressed glass closed top drum lens, and a 375 millimeter cut-glass drum lens. Modified author abstract

Subject Categories:

  • Marine Engineering

Distribution Statement:

APPROVED FOR PUBLIC RELEASE