New forms of instruments for showing the presence and amount of combustible gas in the air . Gas Outlet T. A«r Me*«r Gombuefible GasMet«r Test C bom be i Fig. 2.—Apparatus for determining combustion at the surface of heated wires Wires Used in Investigation.—Table 2 gives the sizes and someof the constants of the wires used in this investigation. TABLE 2 Designation Material Diameter inmillimeters Resistivityat 0° C, microhmper cm 3 Temperature coefficients Remarks A B A Platinum do do do 0. 00382

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New forms of instruments for showing the presence and amount of combustible gas in the air . Gas Outlet T. A«r Me*«r Gombuefible GasMet«r Test C bom be i Fig. 2.—Apparatus for determining combustion at the surface of heated wires Wires Used in Investigation.—Table 2 gives the sizes and someof the constants of the wires used in this investigation. TABLE 2 Designation Material Diameter inmillimeters Resistivityat 0° C, microhmper cm 3 Temperature coefficients Remarks A B A Platinum do do do 0. 00382 B C D Commercial wire. Palladium Gold Silver Nickel Accuracy of Observations.—The accuracy of the standard resist-ances and the sensitiveness of the galvanometer used were greaterthan the general accuracy demanded in the investigation. The w*£bd\ Combustible Gas Detectors 57 resistances of the leads were measured and taken into accountwhenever of any importance, but in most of the experiments thiscorrection was entirely negligible. The currents used were neverlarge

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Keywords: ., bo, bookcentury1900, bookdecade1910, bookidnewformsofinstru15unse