New forms of instruments for showing the presence and amount of combustible gas in the air . the other instru-ments remaining in service until this is accomplished. If, for anyreason, it is suspected that oil or other impurity may have reachedthe active wires and rendered them inactive, they should be heatedto a high temperature for a minute or two by increasing the currentthrough the instruments to amperes. This current will notinjure the detector and will remove any probable impurity whichwould render the wires inactive. When the bridge is first used,the wires must always be glowed in th
New forms of instruments for showing the presence and amount of combustible gas in the air . the other instru-ments remaining in service until this is accomplished. If, for anyreason, it is suspected that oil or other impurity may have reachedthe active wires and rendered them inactive, they should be heatedto a high temperature for a minute or two by increasing the currentthrough the instruments to amperes. This current will notinjure the detector and will remove any probable impurity whichwould render the wires inactive. When the bridge is first used,the wires must always be glowed in this manner. 88 Bulletin of the Bureau of Standards [VoLts 2. GLOWING-WIRE INDICATOR Fig. 21 shows the details of construction and a diagram ofconnections for a portable glowing-wire indicator of the formbelieved to be most suitable for general use. The following speci-fications apply to this instrument: Wires.—The active and inactive wires are to be of pure mm (2 mils) in diameter and 2 cm long. One wire is madeinactive by coating with sealing-in glass. Au(..Vf>.>/-f.
Size: 1154px × 2165px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bo, bookcentury1900, bookdecade1910, bookidnewformsofinstru15unse
