Electrochemical and metallurgical industry . FIG. 2.—DOUBLE-THROW FIG. 3.—CELLULAR STRUCTURE OF BRICKWORK FOR ELECTRICFURNACE. lator, such as asbestos, or, better still, infusorial earth, whichis one of the best heat insulators that can be obtained, and ifpure, is much more refractory then asbestos. ^ I am told that a good grade of infusorial earth is hard to excellent material is put on the market by the Lake Region MiningCompany. 56 ELECTROCHEMICAL AND METALLURGICAL INDUSTRY. [Vol. III. No. 2. At first sight this bench may seem to be a needlessly elab-orate structure, and
Electrochemical and metallurgical industry . FIG. 2.—DOUBLE-THROW FIG. 3.—CELLULAR STRUCTURE OF BRICKWORK FOR ELECTRICFURNACE. lator, such as asbestos, or, better still, infusorial earth, whichis one of the best heat insulators that can be obtained, and ifpure, is much more refractory then asbestos. ^ I am told that a good grade of infusorial earth is hard to excellent material is put on the market by the Lake Region MiningCompany. 56 ELECTROCHEMICAL AND METALLURGICAL INDUSTRY. [Vol. III. No. 2. At first sight this bench may seem to be a needlessly elab-orate structure, and doubtless it would be if furnace experi-ments only lasted half an hour or an hour, but if a furnacerun lasts nine or ten hours, a less elaborate structure wouldnot be suitable. Without the heat insulation in the upperrow of cells the losses would be very serious, and by havingthe lower row of empty cells, it is possible to detect accidents,such as the fusion of the bricks forming the floor of the fur-nace. Such accidents as that arc not infrequent in electric fur-nace
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