An Improved Method of and Means for Detecting Dangerous Atmospheres in Mines and for Operating an Alarm therein.

摘要

14,498. Schauli, G. Jan. 23, 1914. Drawings to Specification. Specific - gravity estimating-apparatus. - In means for detecting dangerous atmospheres, the air to be tested is drawn through a hollow globe delicately balanced and provided with electric contacts which actuate an alarm should the air with any admixed gases be too light or too heavy.