THE CABLE SHIP ON REPAIES. 255 



mediate shaft (19 to 21), or both drums can be run together at 

 slow speed by engine E' by coupling 20 and 21. Or, again, 

 both drums may be run by the two engines combined when the 

 last-mentioned gears are all in together. 



The drums in this arrangement are placed near the centre 

 line X X of the ship, so that cable comes from bows to drum 

 in a direction very nearly coinciding with this centre line. 

 Where the drums are placed abreast with the gear in between, 

 cable comes from bows to drum in a direction somewhat 

 inclined to the centre line and friction takes place at the side 

 of sheaveS; which it is sought by this disposition to avoid. 



The cable gear on the repairing vessel " John Pender," 

 belonging to the Eastern Telegraph Company, is illustrated m 

 Figs. 150 and 151. This refers to the old vessel, not the 

 present one of the same name. The description of this gear is 

 here introduced to show an intermediate stage in the design of 

 these gears. In several pointp, notably the disposition of drum 

 and brake, the method of driving the hauling-ofF gear and 

 other details, the arrangement of the gear has been improved in 

 later designs which will be presently described. This gear was 

 designed and constructed by Messrs. Johnson and Phillips and 

 consists of two distinct sets of gear, each with its own indepen- 

 dent engine, drum and brake. The sets can be coupled together 

 by the clutch on the first-motion shaft with both engines in gear 

 for the heaviest work {see plan). Or either one of the engines can 

 be thrown out by sliding its bevel wheel out of engagement, so 

 working both drums from one engine. When picking up on 

 one end and paying out on the other, as when up to buoy, the 

 drums are used independently, one drum being driven by the 

 engine and the other disengaged from the gear and worked by 

 the brake. The drums are not shown in the plan of the gear, 

 but one is seen in the elevation, with the hauling-ofF sheave 

 and jockey-wheel W immediately aft of it. This sheave is put 

 in or out of gear by the arrangement shown in Fig. 152. The 

 wheel B is on the same shaft as the sheave, and the pinion A 

 is driven from the drum shaft. The motion is transmitted 

 through a pair of spur wheels carried on a bracket which can be 

 raised or lowered by the lever T. When raised, the wheels go 

 into mesh and the sheave is driven at a slightly higher circum. 

 ferential speed than the drum, as required when taking cable 



