New forms of instruments for showing the presence and amount of combustible gas in the air . ur metal pieces (a) screwed to theinsulating piece (6). This constitutes the detector element (A).The base part (B) consists of a metal plate (c), the cover plate (d)having a square opening covered with double gauzes and theinsulating piece (e). The parts are all fastened together and thefour screws (g) extend downward and serve to hold the detectorelement (A) and the cover (c) in place. Four rubber-coveredwires are lead-soldered to the four metal pieces (a) and pass outthrough one side of the insulati
New forms of instruments for showing the presence and amount of combustible gas in the air . ur metal pieces (a) screwed to theinsulating piece (6). This constitutes the detector element (A).The base part (B) consists of a metal plate (c), the cover plate (d)having a square opening covered with double gauzes and theinsulating piece (e). The parts are all fastened together and thefour screws (g) extend downward and serve to hold the detectorelement (A) and the cover (c) in place. Four rubber-coveredwires are lead-soldered to the four metal pieces (a) and pass outthrough one side of the insulating piece (6). The lower partconsists of the cover plate (h) with double gauzes and the baffleplate (i). The parts h and i are similar to d and c, respectively. To assemble the detector, the detector element (A) is slipped onthe four projecting screws (g) and fits nicely against the insulatingpiece {e); the cover (c) is then slipped on and the outside nutsplaced on the screws (g). The four wires are then connected tothe cable. 82 Bulletin of the Bureau of Standards tVol. is 110 VOLTS DETECTORBRIDGE FlG. 17.—Diagram of connections of indicator A %eS] Combustible Gas Detectors 83 The detector wires are to be of pure platinum mm or 2 milsin diameter. Two of the wires (as marked) are to be coveredwith a thin coating of sealing in glass as described in the nextsection. In fusing the glass-coated wires to the copper leads, the greatestcare must be taken not to reduce the glass at the point of copper must be melted in the reducing flame a few milli-meters from the glass-coated wire, the two ends brought quicklytogether, and immediately removed from the flame. The wiresshould be straight when soldered into place. When intended for use in battery compartments, the othermetal parts of the detector, including the gauzes, are to be lead- gsa ks^sxssssssssss^ FroHT of Ca»c T*-AO^«TABUt AlARM P«tH!T« ; Haho Rubber ®2> llWULATtO PT. SLCCVC -? ft
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