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Some perspectives on Eshelby-like forces in the elastica arm scale

In a recent paper by Bosi et al. (2014 Proc. R. Soc. A 470, 20140232. (doi:10.1098/rspa.2014.0232)) an ingenious deformable arm scale was designed and developed. The scale's operation relies on the presence of Eshelby-like forces. In this paper, we gain new insight into the operation of the arm scale by using a material (configurational) force balance and by exploiting an analogy to a system of two pendula.