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Plate IX: Portable Theodolite by Troughton. Close up Illustration.
Book: The Cycolpaedia; or, Universal Dictionary of Arts, Sciences, and Literature. Abraham Rees, D.D.F.R.S.F.L.S.S. Amer. Soc. Illustrated with numerous engravings. Plates. Volume IV. Navigation- Writing by Cipher. London; 1820. Surveying. Plate IX: Portable Theodolite by Troughton. Close up Illustration.