MUSEUM OF COMPARATIVE ZOOLOGY. ihre | 
This tumbler is kept back by the spring W, and the bail cannot be re- 
hooked when the line is hauled taut to reel in. 
The resistance of the bottom soil raises the poppet-valve Z, and the 
specimen of soil enters the cylinder, the water within the cylinder being 
free to escape through the various perforations P, P, eto. 
On hauling back, the poppet-valve falls, or is forced by its spring, ZZ, 
to the valve-seat, and the cone falls, closing the water apertures. When 
the rod has been got on deck the lower part of the cylinder is unscrewed, 
when the specimen of soil may be extracted. 
The poppet-valve arrangement is Captain Belknap’s, but I have taken 
the liberty of employing it somewhat differently from his method. The 
water-valve arrangement I have also changed, for certain reasons of con- 
venience, etc. 
Sigsbee Water Specimen Cup. 
DESORIPTION or Parts. 
The cylinder A. 
The lower valve-seat B, which screws to the cylinder by a right-handed 
thread. 
The detachable upper-valve seat C, detachable to allow the removal of 
the upper valve for cleaning. 
The upper and lower poppet-valves D and Z, connected by a rod of 
spring brass wire, and adjustable by a fine screw-thread at 7. 
A small brass compression spring at G, to prevent a too easy disadjust- 
ment of the valves. 
The framework Æ, fastened to the cylinder with a left-handed screw- 
thread, enclosing the upper valve-seat. 
The German-silver removable sleeve ۰ 
The brass pin J. 
The German-silver shaft A, with right-handed serew-thread (44 to the 
inch) at Z and M. 
A German-silver propeller, composed of two bent blades V, N; the hub 
O; the inside serew-thread P (44 to the inch); the cap Q, remov- 
able, but fitting tight on the hub; and the bevelled lugs A, ۰ 
The German-silver bouching S. 
A German-silver screw-cap with milled head, 7, 7’; bevelled slots, U, U; 
and inside serew-thread V. 
A clamp composed of the two lugs, W, W ; the pivot screw X ; and the 
steel spring wire Y, 
