Paper, 'On rapid variations of atmospheric temperature, especially during Föhn, and the methods of observing them' by John Young Buchanan Buchanan writes: 'The variation of the temperature of the air in the course of a day is a matter of familiar observation. It depends in the first instance on the relative positions of the locality and the sun. The temperature is generally highest a short time after the sun has attained its greatest altitude above the horizon, and it is lowest some time after it has attained its greatest depression below the horizon.' Annotations in pencil and ink. Subject: Meteorology Received 29 May 1894 / 14 June 1894. Read 31 May 1894. A version of this paper was published in volume 56 of the Proceedings of the Royal Society as 'On rapid variations of atmospheric temperature, especially during Föhn, and the methods of observing them'. 1894