II. On the action of heat on gravitating masses

Abstract

The experiments recorded in this paper have arisen from observations made when using the vacuum-balance, described by the author in his paper “On the Atomic Weight of Thallium”, for weighing substances which were of a higher temperature than the surrounding air and the weights. There appeared to be a diminution of the force of gravitation; and experiments were instituted to render the action more sensible, and to eliminate sources of error.