Show new fire detector A new fire d detector of unusual kind hind la Is a fine copper wire encased in fusible metal which in turn Is covered with insulating material and in a copper tube of one tenth of an inch the tube Is strung like a bell or mounted in short sections on porcelain blocks when the temperature increases the sensitive temperature IGO or degrees Fahre fahrenheit nue the fusible alloy is softened and forced through the porous insulation in sul atlon against the copper tube ringing the alarm continuously until stopped |