Abstract

SummaryRecent studies have confirmed the traditional attribution of the invention of the balance barometer to Sir Samuel Morland. Two contemporary references to a 1678 printed pamphlet describing the invention are known but no copy has been located. This paper prints a seventeenth century manuscript copy of Morland's description of his balance barometer. The commentary outlines Robert Hooke's role in the invention. Morland's analysis of the mode of action of the instrument is considered in the light of contemporary comprehension of the barometric phenomennon.