Chemical engineering . the phosphorbronze springs by means of asplit brass sleeve in the wood-en handle. This gives a verysmooth, even motion, and pos-itive contact is made on everyconvolution of the wire, whichallows adjustments of the cur-rent by almost infinitesimalsteps. These rheostats are espe-cially suitable for laboratorywork in electrolysis, where itis necessar> to .^^eciire finegraduations of both currentand potential. To secure apotential regulation the rheo-stat is supplied with two slid-ers, the terminals of the mainconductor are connected withSTAXDiiPE the main sourc
Chemical engineering . the phosphorbronze springs by means of asplit brass sleeve in the wood-en handle. This gives a verysmooth, even motion, and pos-itive contact is made on everyconvolution of the wire, whichallows adjustments of the cur-rent by almost infinitesimalsteps. These rheostats are espe-cially suitable for laboratorywork in electrolysis, where itis necessar> to .^^eciire finegraduations of both currentand potential. To secure apotential regulation the rheo-stat is supplied with two slid-ers, the terminals of the mainconductor are connected withSTAXDiiPE the main source of sup- ply, and the wires to the appa-ratus are connected to the two sliders. By putting the slidersclose together, the difference of potential is very small,whereas, by sliding them farther apart, it can be increased upto any desired point. sheet-steel pan conforming in shape to the screen and sup-ported beneath the screen cloth about J4 of an inch from thesame. The water passing through the screen is caught in the. Centripact Screen. In our last issue we described in an article on the con-centrating plant of the Green Mining & Milling Co., of Silver-ton, Colo., a novel and interesting screening device, the Cen-tripact screen of theTraylor EngineeringCo., of New York a mistake of theprinter, however, Fig. 5,on page 125, was re-versed. We thereforegive again the two illus-trations of the I shows the double-unit Centripact screenfor dry work. .As wasexplained in our last is-sue, the screen is ap-proximately saucer-shaped, and is mountedon a vertical shaft whichrevolves, while simul-taneously successive ver-tical impacts are given tothe shaft and screen, sothat the particles on thescreen are subjected totwo forces—the centrif-ugal force tending to drive the particles towards the periphery of the screen, andan upward impact tending to make them leap from the surface. Fig. 2 is a section of a centripact screen unit for wet most essential feature of
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectmetallu, bookyear1902
