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Connected to the saddle are two pieces of metal —these are called the upper arms; the lower arms are the four pieces of metal that are attached to the upper arms. Figure 2: The principle of hydraulic lifting devices (Pascal's Law): a small force (A), incompressible fluid (B), and a large lifting force (C).John Norman (2009), Fire Department Special Operations, Fire Engineering Books, p.51, ISBN 978-1-59370-193-2