In order that I may give you as brief and explicit an explanation as possible of our discovery, process and inventions, I will first proceed with a description of the plant of the Cowles Electric Smelting and Aluminum Company, now in operation at the works of the Brush Electric Company, at Cleveland, O. :
The apparatus used by us for the purpose of experiment in the reduction of refractory ores for the production of metallic calcium, magnesium, potassium, sodium, silicon, titanium, and the manufacture of aluminum and aluminum-bronze and other alloys, consists of two large Brush dynamos, two resistance boxes and two ammeters, a drying pan, eight fire-brick furnaces, suitable electrical conductors and switches, hoods for carrying off vapor and gases, large carbons--3 x3o inches--for electrodes, screens for sizing charcoal and carbon, and a large mortar and pestle and several washing vats for washing and concentrating tile furnace products. Steampower to drive the dynamos is furnished by the ".Brush Electric Company." The arrangement of the plant so as to effect the reduction of the above-named metals and metaloids, by means of carbon as the sole re agent, is as follows :
Tke Dynamos.--These are, of course, placed in the dynamo room as near as possible to the driving shaft, where they can be kept free from any dust or grit from the furnace room. The larger of these is by far tile most powerful machine ever built by the " Brush Electric Company." It weighs over 7,00o pounds, and at a speed of 9o7 revolutions per minute produces a current of 1575 ampSres with an intensity of 46"7 volts. It is of the shunt-wound type of dynamo, built for the purpose of incandescent lighting; C c~zul~'s ." D.F. I,,