These pumps push hydraulic fluid into several accumulators. Hydraulic pressure was kept constant by means of hydraulic accumulators. Hydraulic energy may be supplied by a pump, or stored in accumulators. The original raising mechanism was powered by pressurised water stored in several hydraulic accumulators. Hydraulic pressure was provided by pressurised accumulators located near this mechanism. The first accumulators for Armstrong's hydraulic dock machinery were simple raised water towers. This was eventually dumped in favour of using hydraulic accumulators. It takes approximately 45 seconds to pressurize the accumulators with all pumps operating. During pressure release the brake fluid is stored in accumulators. The spherical satellite was powered by mercury-oxide batteries and silver-zinc accumulators. The 6800 had two 8-bit accumulators, a 16-bit index register, and a 16-bit stack pointer. Input/Output instructions normally communicate through the accumulators. Universal Carrier armoured vehicles, RAF trolley accumulators, and two Pundit Lights can also be found. It is possible to avoid the multiplications in a software implementation by using two accumulators. Different sets of accumulators could simultaneously work on different algorithms.