Dip Circle


This is one of eight dip circles that Edward Kahler made for the American expeditions sent to observe the transit of Venus across the face of the sun in 1874. It is marked "106." The vertical circle is graduated to 20 minutes. The horizontal circle is graduated to 30 minutes and read by vernier to single minutes. Both are silvered.

Ref: Steve Dick, Sky and Ocean Joined (Cambridge, 2002), p. 250.

Date Made: ca 1874

Maker: Kahler

Location: Currently not on view

Place Made: United States: District of Columbia, Washington

Subject: Science & Scientific Instruments


See more items in: Medicine and Science: Physical Sciences, Science & Mathematics, Measuring & Mapping


Exhibition Location:

Credit Line: U.S. Department of Defense, Dept. of the Navy, U.S. Naval Observatory

Data Source: National Museum of American History

Id Number: PH.327714Catalog Number: 327714Accession Number: 283554

Object Name: Dip Circle

Physical Description: wood (overall material)metal (overall material)Measurements: vertical circle: 6 in; 15.24 cmhorizontal circle: 4 1/2 in; 11.43 cmoverall in case: 11 1/8 in x 11 in x 11 3/16 in; 28.2575 cm x 27.94 cm x 28.41625 cm

Guid: http://n2t.net/ark:/65665/ng49ca746a8-ca96-704b-e053-15f76fa0b4fa

Record Id: nmah_1029374

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