Evening Republican, Volume 18, Number 184, Rensselaer, Jasper County, 6 August 1914 — Smoke-Detector. [ARTICLE]

Smoke-Detector.

A Scotchman, Mr. John Lowden, has invented a “smoke .tintometer,” which. It Is thought, may be of use in prosecuting cases of "smoke nuisance.” It consists of a tube with a single eyepiece and two object openings. One of these is clear, but the other contains a revolving diaphragm In which are set five circles, one of Clear glass and the other four of tinted glasses corresponding with the standard tints of ‘a scientific “smoke chart” In examining smoke-defiled air the diaphragm is turned until the tinted glass coincides in darkness with the air seen through the clear aperture. The various glasses are systematically numbered, so that a glance suffices to show the degree of defilement of the air.