Document LKjOG8mNB0XGo40VD7y6J0Dad

Electronic Speed Control E28 Rtcunto* pRovtou (xcrrATiort and speed control, through magnetic drive, I boiler* draft fans, centrifugal pumps, compressors and blowers. It rectifies 3-phaso power to energiso the magnelio drive and adjust ex citation current to hold output shaft speed to within 1%. Load speed is selected automatically or manually by positioning a small potentiometer. Other parts of the control guard against effects of overvolt* age, undervoluge, short-lime power failure, improper operating tubes and amplifier. Excitation current it balanced against volt* age of a tachometer generator driven by the load; therefore speed Is held constant despite changes In prime-mover speed or changes in load or power-supply voltage. Electric Machinery Mfg Co, Mimte* spoils 13, Minn. reaches pressure for which the device is set. when It trips the vent fatly opened. It can be set for 10 pii, and tripping takes place within j psi of this setting. A dome over opening prevents rein from entering transformer, even after it has operated. Rescuing slier operation It simple and requires no replacement parts other than new gaskets thsl can be made in field. WeslUighouao Electric Corps Box 868, Pittsburgh 30, Pa. Test Instrument E30 DhicmaTCo as Model 1005 electrical lab* oratory, lhla instrument is a complete test unit for electronic and electrical technl* elans in laboratories, shops or service departments. It combines the functions ol over 60 separate instruments end contains six Individual instruments, each with o complete set of ranges. fn addition to a wide variety of te and dc voltage and current ranges, It has a multistage ohmmetcr and a single-phase wattmeter- For eatreme sensitivity, it has a SO mleroammeter providing 20,000 ohms per volt on all dc ranges. This electrical laboratory Is adaptable for testing all electrical appliances, amall motors, circuits, radio seis, etc. Simpson Electric Co, $308 W KinaJe St, Chi* eogo, Ilf. Cooling Tower lrBUcao-nn*rr coouwc toweR it 0( type construction for easy eriioa maintenance, ft Is equipped with muhj " fans. New fealures permit low pumping head, and automatic of off-peak loads. Metallic eonneetan^j j tierods ere concealed. Towers are In sites from 75- to 2000-gpm espathjSi Refrigerating Machinery Co. 525 kei Si# Son Franeieco S, Calif. m piping equipment. * All pre-fabrication i on One Order to CRANE pipe fabrication of every sort (a Crane Co/# .Ejjoesj. From a jimple bend to the molt 'fSmpiex welded assembly, your design Is jVallured of precise fabrication, fully ':*TOPP*d* ktllfHy manned and strategtj.^H- located, five Crane Pipe Shops are at i-r ^VuCraIsUe0r8v^icneC;' rane 1* the simplest procedure ^ok toy piping Job. One order covers every* ` tbiox . * valves, fittings, pipe, and shop* fabricated units. You avoid any worry about fit in the field... or performance. Standard* , idat on Crane Shop Service and the Crane Equipment Line gives you (his 3*woy ad* Ball Valve O! RoCKwood ball valvb is for service M pipelines where full flow, tight seal and; quick opening or closing is desired. Tht Ul floating ball in combination with resfliutg] synthetic-rubber seat allows abrasive puti. cles to be automatically wiped dear of eating surface without Injury to ball a eat. When dosed, pressure of fluid tutsaiatically positions ball against sett to form o' tight seal. Proper allgnarat of hall and seal does not depend upon mrchankal parts. Valve is available Is hronxe with screwed ends in ail pipe she* from | to 2 in. for ISO-psi working preuurv. Roekwnod Sprinkler Co, 38 Harlow St, Worcester S, Maas, vantage-- ONE SOUtce Of want offering the world's largest selection of steel, Iron, and brass i piping materials for all power, process, sad ' geoeral service applications. ONI lElPONSiBiUTY for piping materials-- helping you to get the best Installation, and to avoid needless delays on jobs. OUWANPINO quality in every item--as suring uniform dependability and dura* bility in every part of piping systems. CRANE CO., General Offices: 836 S. Michigan Avenue,Chicago 3, ill. Branchesand VTboieialert Serving All Industrial Areas. (Be/etr) /C-U MAM ST!AM WAD!* completely sbopjabricaied by Crane /or a Mexican Central Station. Owns deet the entirejob .. . bending, weld ing, tfrus-rtlieoing, testing, includ ing radiographic examination. On targe er total)yobt, tiatfile ar nmptex, Crane fabrication Jnffilts every rnlnf /yonr design. Tran,former Release E29 Ttui covcn-MOUNYEO mechanical release device vents internal transformer pressures caused by electric are or overload. Il works quicker and more effectively than the present device that depends upon rupturing a diaphragm. It fits any trans former with a 94n. handhole opening. Adapters can be used (or fitting it to, larger openings, if necessary. The device withstands full vacuum (or transformers designed (or filling under a vacuum. A locking device ia also avail able so tank can be pressure tested-in factory or field. A roller latching arrange ment locks vent lightly until the tank Malleable Braied Filling E33 Flam-Flow turcadlus nmac Is the first black malleable filling ever produced for brating to steel or wrought-iron piping. Braied ioio machined socket in fitting, piping end is flush with shoulder. I'holo contrasts streamlined braced joint (right) with'screwed joint. To insure streamlined.fluid flow, outside of pipe cod is clean and surfaced by special tool. After pipe' is positioned in soeket, fitting Is torch heated until silver-bratini alloy flows in by capillary action to Ion a seamiest, permanently bonded jointBracing alloy flows naturally to all P1*1* of the joint even where piping it clove |p 1 wall or machine to that fitting can he j| heated from one aide only. To remove fitting merely reheat. Ftagg-Flo\e fitting! ere designed parito* larly for pipes 2 in. and smaller, wheri Use convenient reply cards on page 178a ta secoro additional Information . >n those now squlpment items. Pleats bo sura to Idontify your request with tho now-equipment hoy fatter, S, and number, os shewn on the items above- 116 (114) POWER February l'4< 119 ,i jj