Document kDVgD9eYa8kgy2n8pZ71BoxQB

r*r SPEAKING OF POWER panies and railroads. Timetable calls for evolving e basic design for a prac tical machine in (wo years. AAA We can't help enjoying this charac teristic bit of British understatement, from a paper dealing with the effects 82), and (4) planning for the Pennsy a new electric locomotive, half again os powerful as present largest units. Power's new sister publication Op erating Engineer, has been gaining paid circulation at a phenomenal rate--more thon 12,000 in less than 10 months. of atom bombs on naval vessels: "A further problem is presented by pene tration into the living and working spaces of the ship of fission products drawn In by ventilator fans ... or by convection ... I need hardly odd that at the present stole of our knowledge it is considered rather a bed thing to inhale /listen products.'' A* - With radioactive'materials now avail able from AEC ot relatively low cost, "tracers" ore being used in industry as they have been for the past decade in laboratory research. In what was probably the first full-scale investiga tion of this kind. Arthur D Little, Inc, recently determined for Republic Steel This naturally makes the editors feel good, but they got perhaps their big gest kick out of an inquiry from a power engineer in the British West Indies. He wanted to eubscribe, he said, be cause he had run across a page of OE in the wrapping o( a motor shipped from the U. S. It hoppened to be Phil Swain's editorial in the first issue, Corp that of the two forms of sulphur setting forth the plans for the new Every so often some one with pes simistic leanings costa a worried eye on records ol silt deposits in l.ake Mead behind Hoover Dam (Hoover to Boulder to Hoover--remember?) and predicta the near doom of llutt power in cool--pyrilic and organic--both carry over equally into coke. For the test, artificial pyrites were mode from radioactive sulphur and mixed with 12 tons of coal, normal charge to a coke oven. The proportion of the coke's sul magsxine. Our BWI friend sold that was enough to show him that OE was the magazine he needed. Some thrifty manufacturer no doubt put his checking copy to one lost use In shipping, inad vertently-became OE`j salesman. development. In the original planning, phur that came from the pyrites (the A- A Bureau of Reclamation engineers made an extremely conservative estimate, as suming that: (1) no sediment flowed out of the reservoir (2) none deposited above spillway level, and (3) no reser voirs were created upstream. On this basis, known to be too pessimistic, it was estimated that it would take 200 years to silt up Lake Mead. Many other estimated of Lake Meod's Billing rate have been made, and white they differ widely because of uncertainly as to the weight to be given the various (actors affecting silling, they agtee that the development will have a long life. Furthermore, changes now occurring in the area, ond those in prospect up stream, are all favorable to a tower silting rate. "tagged" compound) was found by measuring its radioactivity. Radioactive sulphur for this study cost only $50. Such full-scale testing would have been prohibitively expen sive before the war when that much rodioactive material would have cost thousands of dollars. Use of tracers to control industrial processes looks interesting also. For example, radioactive phosphorus added to a Bessemer converter would show when the last impurity, usually phos phorus, has been removed. Radiationsensitive automatic controls would then turn down and shut off the Bessemer as desired. In spile of need (or strict sofely precautions in their use, radiooclive tracers face a brilliant industrial The Central Electricity Board of Crest Britain has ordered another 15,000-kw gas turbine. This one, for Dunston power station of the NorthEastern Electricity Supply Co, will be built by C A Parsons and Co, Ltd. It has also been revealed that the 12,500kw closed-cycle plant being built by John Brown and Co, Ltd, under Eschcr Wyss license, it to be installed by the North of Scotland Hydro-Electric Board and is expected to be running in 1950. Metropolilon-Vickers Electrical Co announces it Is building a 2000-kw gasturbine set' for standby service in its main works power station at Trafford Park, Manchester. It it on open-cycle unit, with regenerator. A ASpeaking before the New York Rail road Club, Gwilym A Price, Westinghouse president, revealed a 4-pronged future. What will be the first use in the power field? dr it Although there era os many predic THIS MONTH'S COVER attack on the problem of developing tions as there ere experts, all agree that To dramatise low-voltage circuit tomorrow's locomotives. Weatlnghouse prospeeta for further tremendous ex protection, uibject of I^poge Is now: (1) working with B & W on an improved steam-turbine-electric lo comotive, with a radically different high-pressure high-temperature boiler, hoped to reduce coal consumption by pansion in power production, along with development of tho synthetic fuels ond chemicals industries, mean need for vastly increased coal output in years ohead,' and greatly reduced mining tpeelal section beginning on page 19 of this Issue. McCraw-HHI photographer Syd Ksrion took the switchboard shot on Power's cover.An operator is shown dosing a panel-typo elrcult breaker feeding oae-hair (2) cooperating with Lima- costs. This is tho -background behind the de bos. Hamilton Corp on a free piston unit, using a power-gas generator under development for some time by LimaHamilton, and a Westinghouse 3000-hp gas turbine (3) building a gas turbine the coal industry's recent launching of an engineering program to develop a machine that will cut coal "off the solid" without use of explosives and load continuously into a conveyor or Feeder breakers to either side of tho operator are equipped with re lays, which allow each circuit breaker to redose automatically after tripping, provided the fault has clesrod. Breakers shown are locomotive with two'2000-hp power mine cars. Under direclloo of Bi normally controlled from a remote units similar to the recently described tuminous Coal Research, the project experimental machine (Power, Jan has the support of 70 of the nation's point through a supervisory selector system. 1947, pp 98102; March 1948, pp 80- leading coal producers, coal-land com 71 (403) POWER July %pi CIRCUIT PROTECTION By J J O'CONNOR, Aeilfttrn Editor Every engineer reoognizea that protective equipment is necessary to guard circuits ond machines against abnormal conditions. Daxv aged equipment and extended Interruption of production result from poor selection and improper maintenance of devices*deslgned to guard electrical equipment and machine^. Since electrical protection la a form of Insurance, an understanding of the operating principles as veil as types of devices available Is necessary for Intelligent selection and use. To aid In the understanding, selection and application of overeurreot protective devices used in low-voltage circuits. POWER has prepared this, its sixty-eighth, special section. the needs of practical power engineers have been kept foremost In mind in writing the text as well as selecting Illustrations. No attempt la made to oover all protective devices, discussion being restricted to overcurrent protection In circuits of 600 volts, and below, litis presentation divides Into four parts: fuses, circuit breakers, thermal and magnetic devices, and applications. Since the power engineer is interested In good maintenance as well as design and selection, many practical field-tested hints are included to aid lo troublefree operation. p0WER July 1948 P W Swain, Editor