Unpublished manuscript, 'Instructions pour faire des observations météorologique et magnétiques' [Instructions for making meteorological and magnetic observations] by A Th [Adolph Theodor] Kupffer Kupffer shares guidance on making meteorological and magnetic observations, and shares his measurements and calculations. Includes a covering letter from John Washington, Secretary of the Royal Geographical Society, to J G [John George] Children, dated 28 July 1836, a copy of the reply from Children to Washington of 28 October 1836, and a letter from Kupffer to Colonel Jackson, Corresponding Member at St Petersburg to the Royal Geographical Society. Subject: Meteorology / Magnetism Written by Kupffer in St Petersburg [Russia]. 1836