New forms of instruments for showing the presence and amount of combustible gas in the air . -scribed and illustrated under the heading Method of amount of heat from combustion per unit length of wire C foreach per cent of gas entering the test bottle is plotted in Fig. data represented by the curve for hydrogen include the resultsof over ioo observations upon seven concentrations of hydrogenin the gas mixture. The individual observations upon three con-centrations are given in order to show the agreement of heating effect upon the wire of the per cent mixture f
New forms of instruments for showing the presence and amount of combustible gas in the air . -scribed and illustrated under the heading Method of amount of heat from combustion per unit length of wire C foreach per cent of gas entering the test bottle is plotted in Fig. data represented by the curve for hydrogen include the resultsof over ioo observations upon seven concentrations of hydrogenin the gas mixture. The individual observations upon three con-centrations are given in order to show the agreement of heating effect upon the wire of the per cent mixture fallsoff at temperatures above 10000 C. This is no doubt caused bythe fact that combustion takes place at some distance from thewire, and the supply of hydrogen to the surface of the wire isthereby reduced. It will be seen that the amount of carbon mon-oxide burned is almost independent of temperature, while theamount of methane burned increases rapidly with increase oftemperature. 9 o N CO vO M *tf <0 UJZ£L — o if) 1- H 2 o LL CM0 oL :.. 5ooa »oooc TEMPERATURE OF WIRE (DEGREES CENTIGRADE) FlG. 6.—Power from combustion -epresmt average for all concentrations of gas entering test chujnU i i ,i,I !•! uln i .;, cent; 9, percent. Carbon monoxide, 0. S P« Hl Methane, Q. pe86002°—19. (To face page 62.) I500°C per cent; +, per «f - Weaver!Weibell Combustible Gas Detectors 63 Fig. 7 shows the results of tests exactly similar to those shownin Fig. 6, except that different wires were used and that samples ofgas drawn from a point about 2 centimeters below and to one sideof the wire were analyzed and the percentage found by analysiswas used in computing results instead of the percentage enteringthe bottle. It is probable that the results shown in Fig. 7 repre-sent more closely the amount of gas which would be burned by anexposed wire in a large room than do those of Fig. 6. This latterfigure may, however, better represent the performance of a detectorpartia
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Keywords: ., bo, bookcentury1900, bookdecade1910, bookidnewformsofinstru15unse
