Show To Det Detect ct Gas as in Mines MinesA A A. new new ne electrical instrument to det detect detect de de- de- de t t explosive x e gas In n mines mines' has Just been patented Such an Instrument Is necess necessary ry because of or the greatly increased increased increased in in- creased use of electric mine lamps instead instead instead in in- stead of ot the time old Davy Duvy safety lamps The Tile Davy lamp gave gave the miner min min- er warning of or the e pres' pres presence presence nce of ot gas gas ga's but the electric flash ash I lamp Jamp of or course does not The new det detector consists of two glowing electric wires connected In series t f One One wire Ire Is treated treated so so as to tol l hum burn uru 1 more loN brightly In laden gas-laden air than In pure air In perfectly pure pureair pureair air the two wires ires glow with exactly the s same same me brightness By noting noUng the difference In ID the brightness of the two indicators the die te miner c cnn can n n not t oni only detect detect detect de de- t the e presence of dangerous gas but can also tell almost exactly how bow much of ot It Is pres present nt I c. |