Chemical engineering . re mm. of sectionalarea in carbons, having the resistivity of those give an enormously high temperature unless the diam-eter of the carbon was very small. In designing a Borchers furnace the general principles thathave been considered in dealing theoretically with the resis-tance furnace must be kept in mind. It is not necessary to »I. S. patent 778,:»6. December 27, 19W. Elkctrochehical andMetallukcical Industry, vol. III., page 71. Electric SmcUinit and Rcfinin?. by W. Borchers. London, 111. 2l6 ELECTROCHEMICAL AND METALLURGICAL IXDLSTRV. [Vol.
Chemical engineering . re mm. of sectionalarea in carbons, having the resistivity of those give an enormously high temperature unless the diam-eter of the carbon was very small. In designing a Borchers furnace the general principles thathave been considered in dealing theoretically with the resis-tance furnace must be kept in mind. It is not necessary to »I. S. patent 778,:»6. December 27, 19W. Elkctrochehical andMetallukcical Industry, vol. III., page 71. Electric SmcUinit and Rcfinin?. by W. Borchers. London, 111. 2l6 ELECTROCHEMICAL AND METALLURGICAL IXDLSTRV. [Vol. III. No. 6. make ver) close calculations of dimensions because of the un-known factors which enter into the actual working of thefurnace; but time is saved and results more quickly obtainedby making approximations to the theoretical conditions. A furnace actually built at the FitzGcrald and BennicLaboratories for certain experiments is shown in elevation,partly sectional, in Fig. 2, and a plan of the same furnace in. Fia 2.—SECTION OF FURX.\CE. Fig. 3. In the plan the covering tiles and bricks are re-moved. All dimensions are given in centimeters. Ti is theterminal of the granular carbon regulating resistor V, T2 theterminal common to the regulating resistor and the furnace,T3 the other terminal of the furnace. R is the furnace re-sistor, a and b two carbons which pass through the side wallof the furnace, and can be connected to a voltmeter. The fur-nace is built on a fire-brick base of cellular structure, and thecells filled with a suitable heat insulator. The top of the fur-nace is covered with the tile L, and this in turn should becovered with a heat insulator. As shown in Fig. 2, R is con-nected to the terminals T2 and T3 by introducing its ends intothe holes of larger diameter in the terminals and packing thespace between the rod and the inner surface of the holes withgraphite. This method of connection is found to give verysatisfactory results, as it takes care of th
Size: 2676px × 934px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, booksubjectmetallu, bookyear1902
