Paper, 'Report of the general process adopted in calibrating and comparing the standard meteorological instruments for Kew Observatory [London]' by John Welsh Welsh describes in detail the construction, verification, calibration and graduation of thermometers to be used at Kew Observatory. Subject: Scientific apparatus and instruments / Meteorology Received 6 May 1852. Communicated by Colonel [Edward] Sabine. Written by Welsh at Kew Observatory. This paper was published in full in volume 6 of Abstracts of the Papers Printed in the Philosophical Transactions of the Royal Society of London [later Proceedings of the Royal Society] as 'Report of the general process adopted in graduating and comparing the standard meteorological instruments for the Kew observatory'. 22 March 1852