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250 THE MARINE REVIEW 4,000-KW 6-Stace Curtis TURBINE FOR COLLIER JUPITER--Mip-BEARING CAP AND Top INTERMEDIATE HoLpER, INTERMEDIATE AND NozzLE REMOVED sition he can open and close the main throttle valve by hand or can trip it so that it closes instantly. The generat- ing unit is also equipped*with a simple automatic device entirely separate from the governor which trips the main throt- tle in case the speed of turbine exceeds a certain predetermined limit. Electrical Conditions The electrical methods used on_ this ship constitute the simplest known form of electric power transmission, and ap- paratus of similar character is used for a great variety of purposes on shore under conditions far more complicated and difficult and with an immunity from trouble which is practically complete. In many years of production of alter- nating apparatus of this general char- acter and voltage, there has hardly been a case of insulation failure recorded and an investigation of this fact will con- vince any one that the electrical part August, 1912 of this equipment is particularly reliable and that in this respect it is far su- perior to the types of apparatus which have been used for ship propulsion. Furthermore, its nature is such that in the event of trouble, it could be very easily and quickly repaired. The switch- ing apparatus is of an entirely reliable standard type, it can be easily replaced or repaired if it) should: get out of order, and if it were all removed the ship could be easily operated with tem- porary connections. The turbine is so designed that all of its parts are accessible and replace- able and extra parts are carried on the vessel, so that it seems impossible that the machine could be subject to any serious interruption of service. While it is normally operated on the gov- "ernor as described, it is in no way de- pendent upon it since by a simple dis- connection it can be operated by the throttle from a point near the switch- board and motor levers. The turbine has six separate stages and in the event of loss of blades in one or more of these stages, it could quickly be arranged to operate on the remaining stages with- out any renewals. Any one stage of the turbine would propel the ship above: half speed. Turbines similar to this have prac- tically replaced reciprocating engines for most uses on shore and much experience o W.R/KW,|'AT GENERATOR KIND |OF |CURVE PERFORMANCE = : + 4 4 + 1 x O° SUPHT, PIPE PRESS. LBS, GAGE = 190;SUPHTIF&O VACUUM] INS.|HG.228.5°] R.PIM. VARIED 10000 18 s=H120 9000 0 | WATER RATE |PER ISHAFT H7P2 ame eee : MOTOR EER+95% -- © 16 SUPHT. \ 100 na a %OOO 9 ee goin! A------| > i we ae - Ht Sr a To | & yi 4 a , . 1h 80 5000 |: a ew or : : : tp Pad Lu ng o ian ae 170... 4000 = < 1 a tel a mE i2 -- eI ----O160 3000 < zr po : é 50. 2000 aa a 40. 1000 ener ; ; 8 i i 12 i 14 75 oo KNOTS From Test oF GENERATING Unit Run UNpeR Proper CONDITIONS OF SPEED, LOAD AND VOLTAGE EFFICIENCY OF Morors AND REDUCED BY KNOWN