and engineering journal . sd, the insulation is therefore of no great im-linless the insulation of those parts of suchmotors is kept scrupulously clean, trouble is often experi-enced in starting up. With three-phase winder motors thispoint is even more important, not only because such motorsare started and reversed frequently for many hours together,but also because of the higher rotor voltage obtained whenreverse ctuTcnt is applied. EoTOR Tanks. The rotor resistance tanks wdiich were originally suppliedwitli the lari;e majority of the three-phase winders gavecoii^hli lal
and engineering journal . sd, the insulation is therefore of no great im-linless the insulation of those parts of suchmotors is kept scrupulously clean, trouble is often experi-enced in starting up. With three-phase winder motors thispoint is even more important, not only because such motorsare started and reversed frequently for many hours together,but also because of the higher rotor voltage obtained whenreverse ctuTcnt is applied. EoTOR Tanks. The rotor resistance tanks wdiich were originally suppliedwitli the lari;e majority of the three-phase winders gavecoii^hli lalile trouble, because they were too small for ther, (|iiiieil duty and the electrodes were arranged much tooclosely together, a spacing of about f in. between phasesbeing common. Duidng straight winding operations no greatdifficulties were experienced, but flash-overs between theelectrodes were frequent when reverse ctu-rent was applied. Improved Sanitation Underground on the Rand- THE OBRiEN IMPROVED PATENT DRY EARTH CLOSET SECTION showing Hopper andGearing in position of rest,or immediately after footlever has been released. The OBRIEN Premier Dry Earth Closet Systemhas undoubtedly proved itself to be the PREMIERof all dry earth systems, and only requires to beknown on the mines to secure its general adoption. THE PRINCIPLE OF THE SYSTEM IS THESEPARATING OF THE LIQUID FROM THESOLID OR FCECAL MATTER, which is done bymechanism inside the pan. The Liquid is run intoa chamber under or near the pan, which chamberis partly filled with a chemical absorbent prepara-tion, and combining with the preparation therebyforms A PERFECTLY PURE, ODOURLESSSOLID, or by other means treated and allowed toflow away pure. The foecal matter in the pan isautomatically covered with a chemically preparedash, rendering it absolutely odourless, and can behoisted to the surface and carted away in opencarts during the daytime. BY THE SOUTH AFRICAN RAILWAYS andby the NEW SOUTH WALES GOVERNMENTFOR ALL
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Keywords: ., bo, bookcentury1800, bookdecade1890, booksubjectmineralindustries
