EEPORT ON THE DEEP-SEA DEPOSITS. 
3 
cuts Figs. 5 and 6, were always used on board the Challenger for the deeper soundings, the 
latter being exclusively employed during the last two years of the cruise. In these the iron 
Fig. 5 . — Hydra Sounding Machine. Fig. 6. — Baillie Sounding Machine.’ 
A, brass cylinder with butterfly valve B at a, iron cylinder with butterfly valve / at the 
the bottom and a sliding iron rod C at the bottom and brass tube b at the top ; c, cylindrical 
top ; D, stud over which the wire attached iron weight sliding backwards and forwards in 6, 
to the washer E, and thus supporting the regulated by the slit d ; e, iron weights, 
weights or sinkers F, is passed. 
weights or sinkers (F) which surround the iron cylinder serve to carry the line down and 
to force the tube into the deposit, but being detached on striking the bottom, these sinkers 
