Accession Number : AD0487176

Title :   VISIBILITY OF NAVIGATIONAL LIGHTS IN A DESTROYER ARRAY.

Descriptive Note : Interim rept. 1 Jul 64-15 Feb 65,

Corporate Author : NAVY MINE DEFENSE LAB PANAMA CITY FL

Personal Author(s) : Larrimore, Herbert

Report Date : JUL 1966

Pagination or Media Count : 10

Abstract : Visibility measurements were conducted under known normal nighttime operating conditions at sea by the U. S. Navy Mine Defense Laboratory (MDL) on a simulated destroyer running light array to determine its maximum range of identification. The array was tested with plain and fresnel lenses successively with 50/50-watt lamps and 100/100-watt lamps. A calibrated light range established in the Gulf of Mexico permitted continuous monitoring of the atmospheric transmission rate during all visibility tests. Tests were conducted under various atmospheric conditions with several shipboard military observers whose vision has been tested and accepted as normal. These tests indicate that the colored sidelights in the destroyer array are visible 3.5 nautical miles (Average), the white range and masthead lights merge at approximately 5 miles, and the range light is visible to the horizon when the atmospheric transmission rate is 70 percent per nautical mile. (Author)

Descriptors :   (*NAVIGATIONAL LIGHTS, VISIBILITY), DESTROYERS, LIGHT TRANSMISSION, ATMOSPHERES, RANGE(DISTANCE).

Distribution Statement : APPROVED FOR PUBLIC RELEASE