i7 



the pawl. If necessary, the drum can be started by hand as there is sometimes a tendency of the 

 leather discs to adhere to the wire-drum-boss if it has been standing unused for some time. 



Owing to the paying out the tension on the wire is reduced and the ballast-scale 

 descends, at the same time putting on the brake R. But as the weight increases, due to the 

 amount of wire paid out, it will be necessary to add weights to keep the scale in midposition 

 and the brake-band adjusted in proportion. 



A suitable speed of the wire was found to be about 2 metres in the second. 



This speed is not only regulated by the brake-wheel N but also and principally by the 

 friction-wheel. But since the friction-wheel revolves with the shaft, an exact adjustment is difficult 



&wv&. 



Fig. 9. 



to be obtained, it has therefore been found necessary to regulate the friction by other means. 

 Attendant n° 1 presses a piece of leather against the outside of the inner flange of the 

 wiredrum, thereby forcing it against the friction-wheel whereby he can regulate the friction to 

 a nicety. Especially when the ship is in motion is this necessary so as to insure a correct 

 working of the ballast-scale. The purpose of this scale is two-fold. In the first place if the ship 

 is rolling and pitching it falls and rises accordingly, thus keeping a constant strain on the wire ; 

 in the second place, the moment the lead touches the bottom it is intended to take up the 

 slack of the rope and in its descent releases the springs 5, thereby tightening the brake-band 



SIBOÜA-EXPEDITIE II. 3 



