3 Typed letters from Sir Robert Hadfield to Charles F., Sr., regarding research into spontaneous generation of heat in metals, and collaborative prese Show more3 Typed letters from Sir Robert Hadfield to Charles F., Sr., regarding research into spontaneous generation of heat in metals, and collaborative presentation of findings of such research to Royal Society. Includes 1880 reprint of Specification of Herbert John Haddan, Dynamo Electric Machines, etc.; reprint of Proceedings of the Royal Society from October 1918 in which Brush and Hadfield's findings were reported; reprint of 1901 articles by Brush and Edward Morley titled Transmission of Heat through Water Vapour and A New Gauge for Small Pressures; Proceedings of the Royal Society from April 1917 in which Brush and Hadfield's findings were reported; Hadfield's translation of Report on the General Meeting of the Vereins Deutscher Eisenhuttenleute from June 1917. Charles F. Brush, Sr., Papers Series 1: Correspondence Subseries 3: Business and Professional (1876-1931) Box 4 Folder 12 Show less