. Bulletin. 4, black; Xo. 5, very black. The gradations inshade corresponding to the above scale of densities are given in PI. records were made at ten-minute intervals, 20 observa-tions, approximately three seconds apart, being made the basis for 11 1 1 x Briquets, square, 5% bir der in a Briquets, square,7% bindero Briquets, round, 8% binder• Raw Lloydell coal / 5 a c q / / / R / 4 // 7 / // t f) • /s 1 (a. / / f 4 / / D o s °/ , a o ? x , o 1 s X S^ ** 10 20 30 40 50 60 70 80 90 100 110 120 130 140DRY COAL FIRED PER HOUR, POUNDS PER SQUARE FOOT OF GRATE SURFACE Fig. 8.—Amount of he
. Bulletin. 4, black; Xo. 5, very black. The gradations inshade corresponding to the above scale of densities are given in PI. records were made at ten-minute intervals, 20 observa-tions, approximately three seconds apart, being made the basis for 11 1 1 x Briquets, square, 5% bir der in a Briquets, square,7% bindero Briquets, round, 8% binder• Raw Lloydell coal / 5 a c q / / / R / 4 // 7 / // t f) • /s 1 (a. / / f 4 / / D o s °/ , a o ? x , o 1 s X S^ ** 10 20 30 40 50 60 70 80 90 100 110 120 130 140DRY COAL FIRED PER HOUR, POUNDS PER SQUARE FOOT OF GRATE SURFACE Fig. 8.—Amount of heat lost in the form of cinders and sparks. each record. It was assumed that observations made for one minuteat the beginning of each ten-minute interval would represent theaverage conditions for the whole interval. To reduce the numberof observations to ten for each ten minutes every other reading wastaken and the results have been plotted on figs. 9 to 13. 26 TESTS OF EUN-OF-MINE AND BEIQUETTED
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