CHAP, xvin.] 



DEEP-SEA SOUNDINGS 



395 



tube C screws on and off, and contains a double-flap valve to 

 retain the bottom specimen. The sinkers W W, each 25 pounds 

 in weight, conical in form, and pierced with a cylindrical hole 

 through which the Driver rod passes loosely, are slung by wire 



or cod line secured to a flat ring or grummet shown at L and 



passing over the stud G. A stud, K, on each side of the tube fits 



loosely into the slot H in the lower part of the slipping lever M H. 



The weight of the apparatus being taken by the sounding 



