Unpublished paper, 'The conditions which render absolute the readings of the mercurial thermometer' by S A Sworn Sworn describes a series of corrections that must be applied to a mercurial thermometer in order to obtain a 'true temperature' from its readings, which include calibre correction and zero correction. He describes the equipment used in his experiments and shares observations on his results. Annotations in ink throughout. Subject: Chemistry / Physics Received 17 February 1897. Read 18 March 1897. Communicated by [Robert Bellamy] Clifton. 1897