The principles of mechanics presented in a new form / by Heinrich Hertz ... ; with an introduction by H. von Helmholtz ; authorised English translation by D.E. Jones ... and J.T. Walley ..
"Forms the third (and last) volume of his collected works, as edited by Dr. Philipp Lenard. English translations of the first and second volumes (Miscellaneous papers and Electric waves) have already been published"- -Translator's note.
