14 SUBMAEINE CABLE LAYING AND REPAIRING. 



In these engines, "with trunk guides and rods working on one 

 crank-pin brass, an inch or two clearance may be allowed 

 between the brass and crank webs, so giving enough end-play 

 to shift the shaft and pinion in or out of gear. In this case, 

 the end-play is controlled by the vertical lever at the back 

 (Fig. 10), working inacollar on the shaft and fitted with quadrant 

 and lock screw. In the illustration the pinion is in gear ; by 

 setting the lever back, the pinion is taken out of gear. The 

 bed carrying the sounding machine and engine is mounted on 

 a stout wood frame fixed to the aft rails at one end and to a 

 rigid support at the other (Fig. 11). The illustrations show 



Fig. 11.— Mounting of Sounding Gear on Aft Rails. 



the machine in the position for taking soundings with the 

 measuring wheel overhanging the ship's rail. The apparatus 

 is, however, very seldom used in the overhanging position as it 

 is far better when paying out to place it inboard so that there 

 is a fair length of wire between it and the ship's stern. In the 

 arrangement shown in the illustrations provision is made for 

 fixing the sounding gear in either of these positions — inboard 

 or overhanging the rail. For this purpose the platform is 

 made sufficiently long to permit of the sounding gear and 

 engine being shifted further back from the position in the 

 illustration. The frame is provided with guides on each side, 



