THE CABLE SHIP ON REPAIRS. 245 



noticed in the illustration, where the shaft on which the 

 hauling-o£f sheave is mounted is driven by a pitch chain- 

 wheel on the left hand side. The further chain- wheel, which 

 drives the above, is keyed to a shaft driven by a pinion gearing 

 into the teeth on the inside of the brake- wheel. By this means 

 the necessary speed of the sheave is obtaiaed, while at the same 

 time the brake- wheel, being on the drum shaft, imparts to the 

 sheave, through the pitch chain gear, a speed bearing a constant 

 ratio to thao of the drum. After leaving this sheave the cable 

 passes down into the tank through the bellmouth. 



When paying out either grapnel rope or cable over the bows, 

 it is necessary that the cable or rope should be held back, in 

 order to feed it taut on to the drum from the tank. The 

 jockey-wheel and sheave perform this duty also ; but in this 

 case, contrary to the conditions in picking up, the circumferen- 

 tial speed of the sheave must be less than that of the drum, in 

 order to hold the cable back. Ttiis is effected by throwing the 

 sheave out of gear with the drum, and putting on a small brake. 

 In the illustration the lever for putting the shaft out of gear 

 with the pitch chain-wheel is shown at the left end of the shaft, 

 and the brake-wheel is seen mounted on the shaft about midway. 

 The lever of the brake is set once for all to give the right 

 amount of check or back pull on the cable as it advances 

 towards the drum during paying out. 



In the latest cable gears manufactured by Messrs. Johnson 

 & Phillips the driving gear for the hauling-off sheave is pro- 

 vided with free-wheel arrangement, so that the sheave is driven 

 only when cable is being taken aboard. When paying out, the 

 brake is employed as described to hold back the cable, by keep- 

 ing the speed of the sheave slightly less than that of the drum. 

 The free-wheel here comes into action, allowing the reverse 

 direction of rotation to take place without the necessity of 

 putting the pinion out of gear. When picking up, therefore, 

 if it is necessary to reverse and pay out a little slack, the 

 gear acts quite automatically and is a great improvement 

 over the old system, where a pinion had to be put in and 

 out of gear. Provision is also made for traversing the 

 hauling-off sheave across the face of the drum to suit either 

 an inside or outside lead, and this can be worked while the 

 machine is running. 



