Plate, forms of iron bars numbered 1-4 by unknown artist Diagrams of the forms of iron bars [sections] numbered 1-4. Subject: Engineering / Physics Published in Philosophical Transactions as 'On an element of strength in beams subjected to transverse strain, named by the author “the resistance of flexure.” —Second paper'. Received by the Royal Society on 12 March 1857. Read 26 March 1857. [1857]