Clinometer patent by C. A. Schmalcalder, 82 Strand, London, England, 1810-1826. Patent clinometer, British, 1810-1826
Durafilm copy of a map prepared by the Thompson-Watts plotter, Inv. 1961-205, 1953-1954 Durafilm copy of a map prepared by the Thompson-Watts plotter
Photograph : "Antarctic" altazimuth theodolite by T. Cooke and Sons, as used on Antarctic Expedition 1910 Photograph : "Antarctic" altazimuth theodolite by T. Cooke and Sons