Unpublished paper, 'On the daily fall of the barometer at Toronto' by Thomas Hopkins

Description

Hopkins shares tables of the movements of meteorological instruments registered at Toronto in 1846, in the months of January and July, as specimens of the changes which take place in the atmosphere in winter and summer. The principal object of the research was to find the cause of the fall of the barometer in the middle of the day. Hopkins endeavours to show that the vapour, which in the early part of the day was produced by solar heat at the surface, by its expansive power, bore that heat to the upper regions of the air, where it was condensed by the cold of the gases in that situation, when the heat of elasticity was set at liberty to warm and expand the gases, and that it was this expansion which reduced atmospheric pressure in the locality and caused a fall of the barometer.

Subject: Meteorology

Received 19 December 1857. Communicated by William Fairbairn.

Whilst the Royal Society declined to publish this paper in full, an abstract of the paper was published in volume 9 of the Proceedings of the Royal Society as 'On the daily fall of the barometer at Toronto'.

Reference number

AP/40/13

Earliest possible date

1857

Physical description

Ink on paper

Page extent

17 pages

Format

Manuscript