. Bulletin - United States National Museum. Science. 1 igure 10.—Electric furnace for pro- DUCING elemental phosphorus, invented by Thomas Parker of Newbridge. England, and assigned to The Electric Construction Corporation of the same place. The drawing is part of United States patent 482,586 (September 13. 1892). The fur- nace was patented in England on October 29, 1889 (no. 17,060); in France on June 23, 1890 (no. ; in Germany on June 17, 1890 (no. ); and in Italy on October 23, 1890 (no. 431). The following explanation is cited from the patent: Figure 1 [shown here] is a
. Bulletin - United States National Museum. Science. 1 igure 10.—Electric furnace for pro- DUCING elemental phosphorus, invented by Thomas Parker of Newbridge. England, and assigned to The Electric Construction Corporation of the same place. The drawing is part of United States patent 482,586 (September 13. 1892). The fur- nace was patented in England on October 29, 1889 (no. 17,060); in France on June 23, 1890 (no. ; in Germany on June 17, 1890 (no. ); and in Italy on October 23, 1890 (no. 431). The following explanation is cited from the patent: Figure 1 [shown here] is a vertical section of the furnace, and Fig. 2 is a diagram to illustrate the means for regulating the electro- motive force or quantity of current across the furnace. F is the furnace containing the charge to be treated. It has an inlet-hopper at a, with slides A.\, by which the charge can be admitted without opening communication between the interior of the furnace and the outer air. B is a screw conveyer by which the charge is pushed forward into the furnace. c'c' are the electrodes, consisting of blocks or cylinders or the like of carbon fixed in metal socket-pieces c c, to which the electric- circuit wires d from the dynano D are affixed. The current, as aforesaid, may be either con- tinuous or alternating. c-c% are rods of metal or carbon, which are used to establish the electric circuit through the furnace, the said rods being inserted into holes in conductors c3 (in contact with the socket-pieces c) and in the furnace, as shown. g is the outlet for the gas or vapor, h the slag-tap hole, and x the opening for manipu- lating the charge, the said openings being closed by clay or otherwise when the furnace is at work. I use coke or other form of carbon in the charge between the ele< Wf', the said coke being in contact with the said elec- trodes, so that complete incandescence is insured. A means for varying the electro-motive force or quantity of current across the furnac
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