Evening Republican, Volume 18, Number 240, Rensselaer, Jasper County, 10 October 1914 — Illuminated Signal Targets. [ARTICLE]

Illuminated Signal Targets.

With the recent developments in lenses for signal purposes, according to Mr. Thomas S. Stevens, signal engineer for the Atchison, Topeka & Santa Fe railroad, it is now practicable to illuminate signal targets sufficiently for the different colors to be readily distinguished in daylight at a distance of 2,000 feet. All the complicated mechanisms necessary for the mechanical operation of signal arms are eliminated and replaced by simple electrical circuits which are far more efficient and economical to maintain. In the majority of cases two 25-watt lamps are used behind an eight-incb lens. Indeed, it appears that the problem with this type of signaling is to provide a light signal sufficiently visible in bright sunlight which will not make the signal too promient at night—Electrical World.