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September, 1912 Interesting Marine Electric Lighting Sets turbo a normal Eight with generator sets each capacity of 10 kilo- watts, have recently been supplied to Erie the Railroad Transit lines for f- -- -- sek -- -- -- THE MARINE REVIEW and the guaranteed output is main- tained with a back pressure of 5 lb. gage. The turbines themselves are of the well-known Terry single stage type, the best workmanship possible being put into the entire machine. All ro- | Exhaust SECTIONAL PLAN oF TERRY TURBINE LIGHTING SET use on their great lakes steamers by The Terry: Steam ITurbine Co., of Hartford. The necessity for light weight in marine work, together with ample rigidity, was the principal fac-_ tor of consideration in the design of these outfits. The weight of the combined unit, including turbine and generator, is only 1,100 lb., or 110 Ib. per kilowatt. In some cases for electric light work machines of the so-called tour- bearing type have been used. How- ever, the necessity for decreasing the overall length as much as_ possible and the maintenance of true align- ment has led to the present develop- ment of the three-bearing type of unit. In this type the sub-base for the generator is integral with the turbine base proper, eliminating the possibilities of misalignment. turbine and generator rotors are sub- stantially on the' same shaft, being connected by a solid coupling which enable either the turbine or the generator to be easily taken apart without dismantling the whole ma- chine. Six of the sets in question are de- signed to operate with a steam pres- sure of 125 lb. with a maximum of 150, while two of them are designed for steam pressure of 100 lb. The machines are all run non-condensing The tating parts are liberally designed to insure absence of whipping, and are very carefully balanced, both stat- ically and running at full speed, to 315 ature not exceeding 40 degrees in the armature and 45 degrees in the commutator when run for two hours. The generator efficiency at full load and 25 per cent overload was guar- anteed at 86 per cent. A thorough test of all these vets was conducted at the makers' works before shipment, the tests on two of these machines being witnessed by the consulting engineers of the steam- ship line, on March 1 last. The sum- mary of one of the tests witnessed follows: Throttle pressure, pound, gage..... 149.4 High pressure inlet, pound gage.... 114.8 Back pressure of exhaust, gage.... 5 Quality of steam by calorimeter.... .994 Revolutions pér' "minute. . 2.70357 3,200 Volts. vat (terminal. >, 73.535. hee 129.3 Amperes. at términal .. -o45.5 gee ee 86.8 baad in kilowattSvis 8.0.3. st ele 4 'Lotal. pounds, steam per hour....... 779 Total pounds dry steam per hour... 775 Pounds steam per kilowatt hour.... 74.7 Pounds dry steam per kilowatt hour 74.25 Duration of }tést. 2.1.2... eee, 1 hour Momentary speed variation, full load thrown off, per -cént...... chs as 3k 2.18 Settled speed . variation, full load thrown: off; per. Gent. 2. (ears see 0.96 The figures on all the machines were inside their guarantee by a liberal amount. The speed regulation on these machines is deserving of special mention. The mean settled speed variation on the whole eight machines was 1.3 per cent with a momentary speed variation on the worst machine of 5 per cent and an average momentary jump on all the machines of 2.66 per cent. The general appearance and the small amount of room which they oc- cupy is well shown by the accom- 10 K. W. Terry TurBINE-DRIvVEN LIGHTING SET FOR ERIE RAILROAD TRANSIT LINE'S VESSELS eliminate the possibility of vibration. The generators are compound wound for 125 volts and are guaran- teed to run at full load for 24 hours continuously with a rise in temper- panying illustration, the overall di-: mensions of which will be seen to be 4 ft. 7 in. length, extreme width 2 ft. 1% in., and the extreme height 246 1% in,