The Department of Terrestrial Magnetism of the Carnegie Institution of Washington purchased this Lloyd-Creak circle in 1904. The inscription reads "Dover, Charlton Kent. Circle 169." With gimbal stand it cost $527. The vertical circle is silvered, graduated to 30 minutes, and read by opposite verniers to single minutes. The horizontal circle is silvered, graduated to 30 minutes, and read by vernier to single minutes. An auxiliary needle on top is used to determine magnetic declination.
Ref: Carnegie Institution of Washington. Department of Terrestrial Magnetism, Land Magnetic Observations, 1905-1910 (Washington, D.C., 1912), p. 47.
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