Letter, 'Note on a paper entitled "On a new form of stereoscope"' from A Stroh to the Secretary of the Royal Society [John William Strutt] Stroh presents an addendum to his paper on a new form of stereoscope (see PP/8/20), noting that a 'paper [describing] the essential points of the apparatus' had been read to the Dublin Royal Society on 20 January 1879, seven years before the presentation of Stroh's paper to the Royal Society. Annotations in pencil and ink. Subject: Physics Received 28 September 1886. Communicated by Lord Rayleigh [Strutt]. Written by Stroh at 98 Haverstock Hill [London]. A version of this paper was published in volume 41 of the Proceedings of the Royal Society as 'Note on a paper entitled "On a new form of stereoscope"'. 27 September 1886