The Artizan . d traces of copperwere found in the gutta-percha covering. INSTITUTION OP MECHANICAL ENGINEERS. ON THE WORKING AND CAPACITY OP BLAST Mr. Charles Cochrane, of Dudley. At a former meeting of this institution in 1860 the writer read a paper on amethod of taking off the gas from a close-topped blast furnace at the OrraesbyIron works. Middlesbrough, and the original construction of closed tap andlifting valve for charging is shown in the accompanying woodcut, fig 1, the ma-terials for the charges being filled into the exterior space B surrounding thecharging valve A, which
The Artizan . d traces of copperwere found in the gutta-percha covering. INSTITUTION OP MECHANICAL ENGINEERS. ON THE WORKING AND CAPACITY OP BLAST Mr. Charles Cochrane, of Dudley. At a former meeting of this institution in 1860 the writer read a paper on amethod of taking off the gas from a close-topped blast furnace at the OrraesbyIron works. Middlesbrough, and the original construction of closed tap andlifting valve for charging is shown in the accompanying woodcut, fig 1, the ma-terials for the charges being filled into the exterior space B surrounding thecharging valve A, which is drawn up into the position shown by the dottedlines for allowing the materials to fall into the furnace; while the gas is takenoff from the furnace top by the passage E. _ The usual plan of closed top adopted in blast furnaces is that represented infig. 3, in which it will be seen that the materials are filled in against a loweringcone C, placed in the throat of the furnace, which on being lowered into the. position shown dotted permits their fall into the furnace. The tendency of thematerial in this case is to roll outwards from the charging cone to the side ofthe furnace, and thence back again to the centre, as shown in the drawing. It was thought at the time of adopting the plan shown in fig. 1, that theheight of the materials carried by the same furnace would be increased, andthat a corresponding economy in consumption of fuel would result, owing to thecircumstance that where the plan shown in fig. 3 is adopted the level of thematerials must always be maintained at a certain distance below the top, to en-sure the fall of the cone C at charging time. The plan shown in fig. 1 was de-vised with due regard, as it was thought, to the arrangement of the materials inthe furnace; and it was intended that they should arrange themselves as shownby the dotted line in that drawing, part of the larger material rolling to theoutside of the furnace and part to the centre. As long as t
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Keywords: ., bookcentury1800, bookdecade1840, booksubje, booksubjecttechnology
