198 THE PARSONS MARINE STEAM TURBINE AND ITS 
In the mercantile marine, the three-shaft arrangement of turbine 
machinery similar to that installed in the first ship, the King Edward, is 
still used in almost all ships, except those of very large power. (Plate 102.) 
This ship has been in regular service now for eleven seasons and is 
giving splendid results both as regards speed, economy and small amount 
of upkeep and repairs. 
There are upward of 75 ships at sea fitted with similar installations, 
having speeds varying between 17.0 and 25 knots. 
The pioneer liners Victorian and Virginian have the standard three- 
shaft installation, and these ships are maintaining speeds of 163 to 17 
knots on round trips across the Atlantic. On the Pacific Ocean, the Japa- 
nese vessels Tenyo Maru and Chiyo Maru hold all speed records and can 
average about 20 knots. 
Among other well known ships of this class may be mentioned the 
following: 
Knots. 
OQuceti scabs nahi eee era ae ae Driggs 
Onwards dy ot weap. eee ee eRe 22.53 
Mianiximany J sake ed Dect Uren eons genta 23.14 
Vikan gig 253 5 eal rchstey ocdw cid ibe pepe ene Pe eeroe 23553 
Ben-iny-Chreept 5 wai akan: eases one ceens or 25.0 
Jam Breydelgi etyiy: as cchactaeartaa oe 24.30 
SELGeORES ciauhs Ais sn as Gee RO emg 23.0 
Capmiamia ait (ci6) dass tus 4 2 eRe ae eataee Se 20.0 
INGwhawieniog: vgn iatihes ahi ee glued Seg 23.85 
In 1905, a two-shaft arrangement of machinery was installed in the 
steam yacht Narcissus. 
In this installation, the two ahead turbines are arranged in series and an 
astern turbine is fitted to each shaft. 
Pipe and valve connections are arranged so that the high pressure ex- 
haust steam can pass direct to the condenser, and a live steam connection is 
fitted to the low pressure turbine, so that the vessel can be maneuvered simi- 
lar to an ordinary twin screw reciprocating engine installation. (Plate 103.) 
The first vessel built in the United States fitted with Parsons turbines 
was the Governor Cobb, having aspeed of 18 knots. This vessel wasfollowed 
by the Yale and Harvard with speeds of 21 knots. Another vessel, the Old 
Colony, has a speed of 19 knots. All these ships have the regular three-shait 
turbine arrangement with two condensers. The Camden and Belfast are 
smaller vessels than the above and have speeds of 19 knots. ‘The turbines in 
