Chemical engineering . s a Zeiss instrument. The apparatus, mounted on a heavy rectangular bed, withthree rack and four swiveling movements, is adapted to thesystematic inspection of large irregular bodies, wherein thecomparatively long distance from tlie object is of , by means of the stereoscopic camera, interchangeablewith the double tube, this stand performs a very valuable ser-vice, and can best be appreciated in that connection. In directexamination with the lenses provided, a magnification of 10 to65 diameters is attained, and in photographing with the stereo-scopic cam
Chemical engineering . s a Zeiss instrument. The apparatus, mounted on a heavy rectangular bed, withthree rack and four swiveling movements, is adapted to thesystematic inspection of large irregular bodies, wherein thecomparatively long distance from tlie object is of , by means of the stereoscopic camera, interchangeablewith the double tube, this stand performs a very valuable ser-vice, and can best be appreciated in that connection. In directexamination with the lenses provided, a magnification of 10 to65 diameters is attained, and in photographing with the stereo-scopic camera to diameters. Phe depth of the sharppicture necessary to produce the idea of solidity varies, accord-ing to the degree of magnification, from 5 to 10 mm. ( inch). Finally, must be mentioned an apparatus employed for mani-fold metallographic services—the tube furnace. The Institutefor Iron Metallurgy has for many years employed almost ex-clusively the Heraeus electric furnace, in which the heating. FIG. 2.—BK.\ 1:.M;h -IVNii, resistor consists of platinum foil • thick, which iswound in spiral form on a Marquardt tube. These furnaces arenotable for swift, certain and regular service, and are to-dayso improved with suitable heat-guarding arrangements that,for example, in a furnace 500 mm. ( inches) long and30 mm. ( inches) broad a temperature of 1450° C. can becontinuously produced without fear of the foil burning , for furnaces of large section the high temperaturepermissible for continuous experiments is somewhat less. Water=Power Development in W isconsin. The Rhinelander Power Co., of Rhinelandcr, Wis., com-posed largely, if not entirely, of localparlies. has completed ar-rangements to develop the water power of the WisconsinRiver at a point about 6 miles below the city of dam will be built, giving a head of about 24 feet, and suf-ficient water is obtainable to develop an average of about600 hp. I
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectmetallu, bookyear1902
