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A swimming machine, also known as a resistance swimming apparatus, is a self-contained device powered by a pump, designed to facilitate stationary swimming for athletes or recreational users. This can be achieved by either propelling water past the swimmer or providing support for the swimmer, either within a water environment or on dry land.
The pump-action Franchi SAS-12 could accept 3" shells but it did not have a bolt handle cut in the bolt body. The SPAS and LAW could only accept 2 3 ⁄ 4 " shells. The SAS-12 has a barrel length of 21 + 1 ⁄ 2 in (55 cm), an overall length of 41 + 1 ⁄ 2 in (105 cm), a weight of 7 lb 4 oz (3.3 kg) and a capacity of 8 rounds in the magazine ...
Different types of pumps are suitable for different applications, for example: a pump's maximum lift height also determines the applications it can be used for. Low-lift pumps are only suitable for the pumping of surface water (e.g., irrigation, drainage of lands, ...), while high-lift pumps allow deep water pumping (e.g., potable water pumping ...
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The poles can be varied at a ratio of 1:2 and thus the speed can be varied at 2:1. [ 7 ] [ 8 ] [ 9 ] Normally, the electrical configuration of windings is varied from a delta connection (Δ) to a double star connection (YY) configuration in order to change the speed of the motor for constant torque applications, such as the hoists in cranes .
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