An Investigation of Explosion-Proof Motors Page: 13
56 p. : ill.View a full description of this report.
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PROCEDURE OF INVESTIGATION.
ignited, the gas burned as a continuous flame and not as a series of
explosions. Obviously the deflection of the millivoltmeter was maxi-
mum when the ratio of gas to air in the mixture was such that the
greatest amount of heat was evolved when the mixture was burned.FIGURE 1.-Details of gas-percentage indicator. a, Point at which gas is burned; b, spark point; c, water-
gage connection; d, vent for burned gas; e, control valve; f, thermocouple; g, gas intake; h, water-jacket
discharge; i, water-jacket inlet; k, uptake tube; 1, ignition wire; m, millivoltmeter; n, thermocouple termi.
nal; o, double layer of gauze.
For the natural gas used this ratio is 8.6 per cent gas to 91.4 per cent air,
and, as previously stated, this mixture is most sensitive to ignition.
The device was standardized by analysis of the mixtures that gave
maximum voltmeter deflections. The results agreed closely with the13
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Clark, H. H. An Investigation of Explosion-Proof Motors, report, 1912; Washington D.C.. (https://digital.library.unt.edu/ark:/67531/metadc12261/m1/17/?q=%22United+States.+Bureau+of+Mines.%22: accessed June 3, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.