8 
THREE CRUISES OF THE “ BLAKE.” 
much smaller tank than is necessary when the axle is retained. 
When a reel containing wire is out of use it is generally kept 
in a tank of oil. 
axle. 
A crank is provided for each end of the 
The register (B, Fig. 4) is the same as that used by Sir 
William Thomson, and is worked by a screw-thread attached to 
Fig. 5. — Sigsbee Sounding Machine, end 
(Sigsbee.) 
view. 
springs (thirty-one inches long, 
the axle of the reel. The reg- 
ister evidently does not record 
fathoms, an interpolation being 
necessary in determining, from 
the reading of the register, the 
length of wire payed out. It is 
very handy, however, for keep- 
ing an approximate account of 
the wire payed off, so that. the 
correct amount. of resistance can 
be applied to the reel. The cor- 
rection of the register is easily 
found by the method used on 
board the “Blake.” See p. 14. 
The reeling-in or strain pul- 
ley (C, D, E, Fig. 4) is com- 
posed of three separate pulleys, 
C, D, and .£, —the score # for 
the wire ; the score C for а con- 
necting rubber or rope band 
with the friction score of the 
reel, if desired; and the score 
D for an endless rope-band 
connecting with the hoisting- 
engine. 
The accumulator is composed 
of the tubes F, F, F, and C 
(Figs. 4, 5), containing spiral 
two and a half inches outside 
diameter, four feet movement for one hundred and fifty pounds 
strain directly applied), connected with movable cross-head Æ 
(Fig. 5) by means of the chain (or wire rope) J, Z (Figs. 4, б), 
