This instrument was made between 1878 when the United States Coast Survey became the United States Coast and Geodetic Survey, and 1887 when Saegmuller began putting serial
numbers on Fauth instruments. It was described as variously a Reconnoissance and Mining Transit or a Complete Transit Theodolite. Its horizontal and vertical circles, each of 4 inches
diameter, are divided on silver, and read by opposite verniers to single minutes. New, it sold for $200.
Ref: Fauth & Co., Catalogue of Astronomical and Surveying Instruments (Washington, D.C., ca. 1877), p. 33.