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Pneumatic Lifting Bags". Windsor Fire & Rescue Services. Archived from the original on 28 December 2011 . Retrieved 6 October 2013.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. John Norman (2009), Fire Department Special Operations, Fire Engineering Books, p.51, ISBN 978-1-59370-193-2 Figure 2: The principle of hydraulic lifting devices (Pascal's Law): a small force (A), incompressible fluid (B), and a large lifting force (C). Detroit Listening Post". Popular Mechanics. 132 (4): 44. October 1969. ISSN 0032-4558 . Retrieved 9 June 2017.