. Railway age gazette . er centTo make the necessary experiments a very inexpensive outfitwas used, as shown in Fig. 1. The pulverizer was a multiplegrinder made by the Hardy Patent Pick Company, , and consisted essentially of four interior communicat-ing chambers of successively increased diameter in which paddlesrevolved on arms with correspondingly increased radii. Thelargest chamber contained a screen through which only the finedust passed. Coal of the analysis given, previously crushed tonut size, was fed into the hopper by hand, this being the onlymeans of regulating the
. Railway age gazette . er centTo make the necessary experiments a very inexpensive outfitwas used, as shown in Fig. 1. The pulverizer was a multiplegrinder made by the Hardy Patent Pick Company, , and consisted essentially of four interior communicat-ing chambers of successively increased diameter in which paddlesrevolved on arms with correspondingly increased radii. Thelargest chamber contained a screen through which only the finedust passed. Coal of the analysis given, previously crushed tonut size, was fed into the hopper by hand, this being the onlymeans of regulating the necessary supply of coal to the combustion air blast was connected to the pulverizer justbelow the hopper to transfer the coal to the pulverizer coal was thrown out radially by centrifugal force due tothe rapidly-revolving arms and reduced to dust by percussionand attrition and delivered by air current through the screento the apparatus pulverized coal containing 3 per cent of mois-. Fig. 2- -The Powdered Coal Fire Is Shown at A ; B Is a Hard CoalFire ture to a fineness of 78 per cent through a 100 mesh screen, or91 per cent through a 60 mesh screen. The coal was burnedin the furnace with very satisfactory results. The furnace used was an ordinary 5 ft. 9 in. by 2 ft. 9 coal furnace used for heating long rods from whichrivets and spikes were made. To make the furnace adaptablefor burning powdered coal it was necessary to build a 3 ft. com-bustion chamber on the rear as shown in Fig. 1, and to removethe grate bars and fill the furnace with brick, to make a hearthon which to lay the rods as shown in Fig. 2. This illustra-tion also shows that there is very little difference between theappearance of the powdered coal furnace A, when working well,and an anthracite coal fire, B. The table shown below gives the results obtained with thisinferior outfit, and also for comparison, the daily average recordof another furnace which was equ
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectrailroa, bookyear1913
