Paper, 'Observations on the upper partial tones of a pianoforte string, struck at one-eighth of its length' by Alfred James Hipkins Hipkins writes: 'This is a postscript to my paper on the harmonics of such a string, read on the 20th of November, 1884 [see PP/5/25]. According to Professor Helmholtz’s theories, the tone of a struck string is compounded of a number of simple partial tones, with the ratios of their frequencies as 1, 2, 3, 4, &c.' Annotations in pencil and ink. Subject: Music / Physics Received 7 January 1885. Read 15 January 1885. Communicated by Alexander John Ellis. A version of this paper was published in volume 38 of the Proceedings of the Royal Society as 'Observations on the upper partial tones of a pianoforte string, struck at one-eighth of its length'. [1884-1885]