The "FAUTH & CO.” and “C.&G.S.” and “NO. 417" inscriptions indicated that this heliotrope was made after 1878 when the U.S. Coast Survey became U. S. Coast and Geodetic Survey, and before Saegmuller's move to Rochester in 1905. New, with case, it cost $20.
Fauth termed this a "Pocket Heliotrope, Steinheils, a beautiful instrument that requires no adjustment." The reference is to the German physicist, Karl August Steinheil, who introduced the form in 1844.
Ref: Fauth & Co., Catalogue of Astronomical and Surveying Instruments (Washington, D.C., 1883), p. 53.
K.A. Steinheil, "Das Heliotrop," in H. C. Schumacher, ed., Jahrbuch für 1844, pp. 12 17.
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