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<p>In the spring of 1916 an investigation of some of the forms of gas-detectors in use was begun by the Bureau of Standards. None of the existing forms of apparatus was found suitable for all purposes, and the investigation has led to the design of several new forms, which are more reliable than the old ones or better adapted to certain specific uses. All the new devices described depend upon the combustion of the gas contained in the surrounding atmosphere at the surface of an electrically heated platinum wire. The following devices which have been developed are suited to various uses: - 1. The 'compensated bridge indicator,' depending for its operation upon the change in electrical resistance of the wire, gives a continuou
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