Fire prevention in metal mines

A disagreeable odor, shot through ventilation lines at the rate of thousands of feet per minute, will be used to warn miners of fire in all metal mines complying with the provisions of the American” Standard code for fire fighting in metal mines. The standard has been approved by the American Standards Association following its submittal by the National Fire Protection Association and the American Mining Congress, sponsors for the joint technical committee which has been working on the standard under American Standards Association auspices since early in 1925.