Papers in Connection with Apparatus and Instruments Contains papers on a variety of scientific instruments and apparatus, including the Telotype, Altazimuth, hand heliostat, wave machine, the "Tactor" machine, sextants, a hypsometer, and humidity clock. The material comprises descriptions, diagrams, calculations and correspondence with instrument makers and Galton's friends, acquaintances and peers with regard to procurement, design and manufacture of instruments. 1850-1906