Factory and industrial management . The furnaces preferred are all gas-heated,these being most convenient to operate and most certain in cost of operation, moreover, is little or nothing higher than thatof the other forms unless the price of gas is exorbitant. In that casea small plant for manufacturing gas would be desirable. Provisionsfor quenching, of course, are essential. And finally, there should bea fairly good pyrometer, for observation of temperatures. Thenovice especially needs the guidance of such an instrument. Pyro-meters suitable for this purpose are now obtainable in
Factory and industrial management . The furnaces preferred are all gas-heated,these being most convenient to operate and most certain in cost of operation, moreover, is little or nothing higher than thatof the other forms unless the price of gas is exorbitant. In that casea small plant for manufacturing gas would be desirable. Provisionsfor quenching, of course, are essential. And finally, there should bea fairly good pyrometer, for observation of temperatures. Thenovice especially needs the guidance of such an instrument. Pyro-meters suitable for this purpose are now obtainable in a variety offorms, both reading and recording, at very moderate cost; and thesegive very satisfactory service, some of them continuously and accu-rately with little or no attention. Such an adjunct to a hardeningplant is of course desirable, and indeed essential, under ordinary cir-cumstances ; but it is especially important in connection with thebarium bath, while the operator is becoming familiar with the process,if not A CYLINIJKICAL FURNACE (HOOD NOT IN PLACE) WITH GRAPHITE CRUCIBLE. Used in hardening high-speed steel tools bj the barium-chloride process. Made hy the American Gas Furnace Co., ^«e^v York. 734 THE ENGINEERING MAGAZINE.
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Keywords: ., bookcentury1800, bookdecade1890, booksubj, booksubjectengineering
