a. A cylinder containing water or oil under pressure of a weighted piston
for hydraulic presses, hoists, winches, etc. It is between the pumps and
the presses, keeps a constant pressure on the system, and absorbs shocks.
b. A storage battery.
c. In oceanography, a spring of rubber or steel attached to a trawling
warp, to lessen any sudden strain due to the trawl catching. CTD
Dictionary of Mining, Mineral, and Related Terms