Paper, 'Experiments on the elasticity and strength of hard and soft steel' in a letter from Thomas Tredgold to Thomas Young Seven manuscript pages and one plate showing an apparatus for measuring flexure. Subject: Metallurgy Published in Philosophical Transactions as 'Experiments on the elasticity and strength of hard and soft steel. In a letter to Thomas Young, M.D. For. Sec. R. S. By Mr. Thomas Tredgold, Civil Engineer'. Written by Tredgold in London. Read 25 March 1824. Abstract of the paper published in Abstracts of the Papers Printed in the Philosophical Transactions of the Royal Society of London [later Proceedings of the Royal Society of London], Volume 2, 1833. 16 December 1823