The hydrostatical works of George Sinclair ( c .1630–1696): their neglect and criticism

Abstract The Scottish natural philosopher George Sinclair (or Sinclar) (c.1630–1696) was one of the earliest British writers on hydrostatics. He visited London in 1662, when he met Sir Robert Moray and Robert Boyle and left a manuscript treatise at the Royal Society. Receipt of this work was never recorded by the Society, and Sinclair felt that he had been dealt with unfairly. A Latin version, Ars nova et magna gravitatis et levitatis, was published in 1669, followed by his Hydrostaticks in 1672. All Sinclair's works were vituperatively and pseudonymously criticized by James Gregory and William Sanders in The Great and New Art of Weighing Vanity of 1672. Here, Sinclair's life is summarized, and his disputes with the Royal Society and with Gregory and Sanders are examined. It is argued that, despite his other limitations, Sinclair's knowledge of hydrostatics was considerable, and that the criticisms made against him were exaggerated. Yet his work was subsequently neglected. Sinclair's treatment sheds light both on academic rivalries and on the procedures of the early Royal Society.