. Electrical world. tering the laboratory of the grimyambient which in Pittsburg passes for atmosphere, undergoes thor-ough filtration. The refinement of care with respect to the materialdoes not cease, however, in the chemical laboratory proper. Eachtime that new- material is prepared a portion is made into test glow-ers, which are then mounted as if in lamps, and a careful recordof performance kept. The admirable organization of the Nernstworks is very well shown in the elaborate records kept of glowermaterial from its crude to final state. Bv means of this system ELECTRICAL WORLD and ENGINE
. Electrical world. tering the laboratory of the grimyambient which in Pittsburg passes for atmosphere, undergoes thor-ough filtration. The refinement of care with respect to the materialdoes not cease, however, in the chemical laboratory proper. Eachtime that new- material is prepared a portion is made into test glow-ers, which are then mounted as if in lamps, and a careful recordof performance kept. The admirable organization of the Nernstworks is very well shown in the elaborate records kept of glowermaterial from its crude to final state. Bv means of this system ELECTRICAL WORLD and ENGINEER. Vol. XLIII, No. 21. everj step from the crude material to the finished product is a mat-ter of record, and as a consequence any abnormahty can at oncebe traced to its source. The net result of this system of recordsand stage tests is to give complete assurance that when once mount-ed in a lamp, each glower will give the exact performance for whichit was destined. In fact, throughout the factory one is everywhere. 2.—PROCESS OF M.\KIXG impressed at the care bestowed on that part of its organ-ization which relates to securing exact uniformity of product. Previous to the description of the process of mounting glowers,some data may here be given as to their dimensions. At normaltemperatures practically non-conductors of electric current, whenheated the Nernst glower possesses most of the properties of ordi-nary conductors. An exception is with respect to the method ofconduction, but as the electrolytic theory on this point has no bear-ing on what follows, it may be here ignored. To adapt to differentvoltages and currents, the cross section and length of the glower isconsequently varied as in the case of the incandescent lamp single filament of a 25-cp., 110-volt lamp has a diameter of .025in., and a length over all of .62 in., the corresponding dimensionsfor a 220-volt lamp being .014 in., and i in. In the three
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectelectri, bookyear1883
