John Whitehurst: Tracts, philosophical and mechanical; to which are prefixed, memoirs of his life and writings. Pages: 20, 11, 34, 6, 9, vi, 52p. Published: London, W. Bent, 1812. Contents same as ''works'' with the exclusion of ''an inquiry into the original state and formation of the earth''. Observations on the ... of rooms… published 1794. Part of the Strutt Library 1812