George Adams Boxwood and Brass Sector, London, c. 1760, arched brass hinge marked G. Adams/London in bold block letters, other calibrations on the brass hinge include Tan/Latt./Hour, with the boxwood engraved scales calibrated with tables for Line/Chor/Sec and Sine/Tan/Tang, lg. 12 in.
George Adams Boxwood and Brass Sector, London, c. 1760, arched brass hinge marked G. Adams/London in bold block letters, other calibrations on the brass hinge include Tan/Latt./Hour, with the boxwood engraved scales calibrated with tables for Line/Chor/Sec and Sine/Tan/Tang, lg. 12 in.
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