✍ Scribed by R.H.O.
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Pump test results showed a maximum efficiency of 86 per cent. with discharge of 41,2oo g.p.m, against 656 ft. head. A maximum water wheel efficiency of 91.6 per cent. was obtained at about 0.9 rated load and 554 ft. head. R. H. O. Stationary Commutator D. C. Motor.--In a paper by Dr. E. F. W. ALEXANDERSON AND A. H. MITAGG presented at the A. I.
E. E. winter convention there was announced the development of the Thyratron motor which has series direct current characteristics and operates on alternating current. It was made possible by recent advances in electron tube applications. One such motor is now on test. It is rated at 400 hp. 625 r.p.m., and 75 hp. at 350 r.p.m., and is intended for driving an induced draft fan. The motor speed may be controlled down to a standstill. It operates from 2300 v., 3phase, 6o-cycle power and has a stationary armature and revolving field. The electron tubes perform commutation and grid-controlled rectification, the latter providing continuous power control from standstill to maximum speed. R. H. O.
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