Evening Republican, Volume 21, Number 180, Rensselaer, Jasper County, 16 August 1917 — WARNING SIGNAL IS UNIQUE [ARTICLE]

WARNING SIGNAL IS UNIQUE

Warning Siren Is Operated During Day Time and Searchlight Stop Signal at Night. • A proposed warning signal for use at railroad crossings would be set In action by the blast of the locomotive whistle some distance off. It Is claimed that by accurately co-ordinating the vibration pitch of the signal receiver with the note dfdhe locomotive whistle the system is qiffte practical, and that it will not respond to other loud noises which are not correctly pitched. The inventor would use the vibration of the receiver to,close an electric circuit, which would pass the current to a warning siren tn daylight and to a ! searchlight stop signal at night.