THE WORLD'S ADVANCE 



61 



In the circle: "The interpreter who shows 

 the ironmonger the meaning of each line and 

 curve and whose little office alone contains 

 the pedigree of each and every part, down to 

 the smallest rivet." 



"Every plate and iron must first be 

 reproduced in wood or paper. Upon 



the floor of the building the plans 

 of the entire ship are engraved full 

 size, and upon these lines the paper 

 patterns are laid, as are also the 

 wooden moulds for the section of 

 the ship." 



driving mechanism. The generating 

 plant is composed of two independent 

 turbo-generators, each of which is ca- 

 pable of delivering one-half of the total 

 power necessary to run the ship at her 

 maximum speed. The driving motors 

 are of the three-phase variety and each 

 motor is equipped with two sets of pole 

 pieces one of twenty-four poles and 

 the other of thirty-six. The electrical 

 reader will understand that by operating 

 the motors on one or the other set of 

 poles, the speed is changed without im- 

 pairing the efficiency in any way. The 

 plan of operation is to drive the motors 

 at the lower speed for cruising with 

 only one turbo-generator in operation, 

 while for the greater speed the two gen- 

 erators would be operated in tandem 

 with the motors arranged to run at their 

 maximum speed. Thus it will be seen 

 that when cruising, the one generator is 

 running at its full efficiency as are also 

 the motors, while the second generator 

 is idle. Likewise, when full speed is 



required, the second generator is started 

 and run also at its peak of efficiency. 



The installation on the Jupiter does 

 not combine the feature of a double tur- 

 bo-generator,, but in all other respects 

 it may be said to correspond with the 

 plant to be installed in the California. 

 Hence, it is safe to assume that with the 

 added safeguard of a duplex generating 

 unit, the drive for the California will 

 fulfill all of the expectations of the .de- 

 signers. 



Having elicited the foregoing infor- 

 mation relative to the propelling mech- 

 anism of the new vessel, the writer 

 ventured an inquiry as to when the ac- 

 tual work upon her would be started. 

 To his surprise the answer came that 

 the preliminary work had been going on 

 for six weeks past and that the moulds 

 for the keel were being laid. Now, to 

 the green landlubber this statement 

 brought up a mental picture of enor- 

 mous traveling cranes lifting into posi- 

 tion huge pieces of material in the ship- 



