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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. Lifting Bag and Poppet Riveter Repair "Forts" ". Popular Mechanics. 81 (1): 26. January 1944. ISSN 0032-4558 . Retrieved 9 June 2017. John Norman (2009), Fire Department Special Operations, Fire Engineering Books, p.51, ISBN 978-1-59370-193-2
Detroit Listening Post". Popular Mechanics. 132 (4): 44. October 1969. ISSN 0032-4558 . Retrieved 9 June 2017. Figure 2: The principle of hydraulic lifting devices (Pascal's Law): a small force (A), incompressible fluid (B), and a large lifting force (C).
Pneumatic Lifting Bags". Windsor Fire & Rescue Services. Archived from the original on 28 December 2011 . Retrieved 6 October 2013. Read our guide to buying the correct equipment when lifting your car, this guide includes how to select the right products for you and the basic steps involved in using them.