Document RJLNRBdjO8XyDQkpBpyyN6bmE

indicator. DEPENDABLE, becauso permanent calibration is a natural characteristic of tuned reeds. STURDY, because there are no delicate pivots, jewels or moving parts. and t&eM .. . EA9Y-TO-READ vibrating reed-lip* lorm a dearly detlnod pattora. irmi MAINTENANCE < a result el simple, sturdy construction, low INPUT POWCt ! suttlcianl to. aotualo tiro reed comb. OPERATE tN ANY POSITION with out allecting accuracy. ORDINARY ROOM TEMPERATURE VARIATIONS HAVE UTHK EPfECT on calibration. OPERATE WITHOUT DIRECT CONTACT wilh moving parte nndor test EASY TO OPERATE . . . may be held against or mounled on ma chine. Frthzzi Resonanl-Reed Tachometers in round, rectangular and miniature type* are available In ranges betwoen the limits-of 900 and 100,000 rpm or vpm. Made (or permanent mounting on turbines, generators, motors, blowers, centrifugal pumps, diesel-electric Installations, etc. Made also Ln hand types for a wide variety of uses. Write today for Bulletin 1810-P. _______________________ FRAHM" Resonanl-Reed FREQUENCY METERS . . . Sptul* M lbs urn* aalqu* pHstfph fraba Tacboiatr aacvpt that t**d rtbtaltoa U product lactriesUr IiSn4 cd by dlrvef bmImImI eeotael, - AUibW la wliebbdaid, slaUtat* sad portable lyywa lor utgM b*t**i 19 ltd 900 ayelar par Mooed. To aoal rpaola) raquUanaata, rra ua aqaippad (a bolU laftninoat* far mOMorioa'Iteqaaeatoa u blgb a 1400 ep- for evmplala talorma. Hm writ* today lor BoDotta ITTO-P. JAMES G. BIDDLE CO. ELECTRICAL A SCIINTIMC INSTRUMtNTE 1916 ARCH STRUT a PHILADELPHIA 1. PINNA. MS (S7a) mounted on the driving head aadj to receive the pump's ahaft-i^p*? Impeller adjustment is made a the shaft's top end extends throu^' driver's hollow shaft. Tbe drivey* contains bearings to carry thrust load developed by the Motors, Fig. 1 and 2, rigi^.g gears. Fig. 3 and 6, and flat co.r ^V; assemblies are the commonest --all of vertical hollow-shaft dal^' flexible-coupling drive Is used vertical solid-shaft prime moiQ desirable. J When operation requires more: one driver a combination drive h j For example, pumps are soroeUnjJ molly driven by- an electric motf combination with a right-ongU} drive for emergency operation by I line or diesel engine. Q tO--What types of ImpotUn used In eerrlcof-turbtne pumps? j A--Single-suction enclosed impdi Fig. 4, in which the waterways am i shrouded from suction to diictiij and aemlopen impellers. Fig. 5, vi have only a top shroud. Vertical 3 ance of the impellers in their boiii obtained by an adjusting nut s*i shaft's top extending through the pr drive. i Semlopen impellers do not ope with elose radial clearances sod wearing-ring clearance in an estk impeller pump. They ore gentj considered to have some adrn when pumping sandy water, uj possibility of aand locking Is rtda Vertical clearance la ImporUols semfopen-impeller pump because, i mum performance can be obtained when the Impellers are adjusted b erate aa closely as possible to the,] faces. A semlopen Impeller donk greater hydraulic thrust than as e alent enclosed Impeller because t out a lower shroud, there Is s u area that is hydraallcally unbals _ II J Q Zl--lPhat accessories ere ossd. vorlltat-tutblno pampsf A--Suction strainer* E of tbs., ical type, Fig. 2, for wells or _ bosket design for sump and pit *! are commonly used to prevent d> trance of trash and large objects feet or more suction piping at* ! fitted to well pumps to allow fotj sible lowering of the pumping ^ ground water. Equipment ean be famished io termining the water level In * Pumps with open shafts j t\ equipped to lubricate the rd bearings before starting. Follow facturer'a instructions regardfof; ^OWgg lubrication. Many types of m*9^ r). L, D V, Action f itsam In Tsrry wheat Nubia*. Th* itaam btuai Iron aipandlng node at high *- loclty and antan th* rid* of Iha whaal bucket tn which lit dlree- flon It ravarttd 110*. At thti ringl* ravartal out but a por tion of th* available energy, th* itaam It caught In a ria* tlenary ravanlng chambar and returned again la th* whaal. Tbit precati ii rapaatad tavaral tlmai until practically || of th* inaful anargy hat baan utDbad. NO PARTS TO LOOSEN OR WORK OUT The rotor of tho Terry Wheel Turbine is a single forging of spocial composition slool, In which series of semicircular buckot* It mfllod. Thero aro no separate parts to bocomo loos or work out. The power-producing action of tho stoem takos place on tho solid curved backs of these buckets or pockets. Therefore dote clearance is unnocosaory and wear on tho blades forming the poexots Is of little con sequence, es it does not materially effect horsopower or efficiency. For detailed information about this effec tive construction and Its advantages, write us on your businoss lottorheed for e copy of Terry Turbine Bulletin S-l 16. T-tm THE TERRY STEAM TURBINE COMPANY TERRY SQUARE, HARTFORD CONN. January |fB 149 POWER