matic economically, if the same effect can be pro- switch or cut-out (Fig. 5) is used by which duced with a lower temperature and a con- a number of thermo-elements may alternate- sequent saving of coal. Another considera- THE ly be placed in circuit with the registering tion, particularly in iron… … sistance to the electric current, becomes incandescent Fig. 3.—HOT.AIR CONDUIT OF A BLAST FURNACE piles can be thrown into circuit with the measuring when the current passes. This bridge is inserted in a WITH THERMO-ELEMENT. and registering instrument. This is placed upon a capsule containing an…
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