accumulative (akumulativ)

[ Σ 41 cumulation (which see). - 3. Anything used for collecting and storing energy, etc. Specifically, in mech.: (a) An india-rubber spring serving for the storage of energy to be utilized for lifting and other purposes. (b) An elastic section of a dredge-line, so placed as to prevent a sudden breaking strain. (c) An apparatus used principally in connection with hydraulic machines as an equalizer of pre ure, or for the accumulation of energy to be expended intermittently, as in hydraulic cranes, elevators, riveters, etc. It consists of a cylinder fitted with a plunger, having at its upper end a cro -head or cap, to which are secured the weights nece ary for the desired pre ure. The water 9 Hydraulic Accumulator. a, cylinder; 6, plunger; c, gland; d, weight-case; e, cro head;, bolt; g, framework; h, i, pipes. forced into the cylinder raises the plunger, whose weight, reacting upon the water, transmits this pre ure to the operating machinery. The total force, le friction, which can be expended is measured by the product of the weight of and load into the distance traversed by nit The joint capacity of the force-pumps which supply the cylinder is such as will, by continuous running, accumu late in the cylinder during periods of inaction an amount equal to that expended during a maximum effort. In another form, called the hydro pneumatic accumulator, the water within the cylinder compre es air, which reacts upon it, thus serving as a substitute for the weights. By availing ourselves of the hydrostatic pre ure of water stored at high elevations, or by storing it under C. P. B. Shelley , Workshop Appliances, p. 313. (d) In elect.: (1) A condenser (which see). (2) A storage battery (which see, under battery ). - Hydro-pneumatic accumulator, an apparatus intended to be used with hydrostatic lifts and pre es, and employing compre ed air as the source of power. See above, 3 (c).