Edson's Hygrodeik

Description:

William Edson, a civil engineer in Boston, designed a "Hygrometrical Index" that, when connected to a common wet and dry bulb hydrometer, "will enable any one, by simple inspection of the instrument, to ascertain the relative humidity and dew-point of the air, also the absolute amount of moisture in the air, without the aid of tables or calculation." In this example, which came from Cornell College, the paper chart is marked "EDSON'S HYGRODEIK MANUFACTURED BY N.M. LOWE, BOSTON." Nathaniel M. Lowe is known to have manufactured Edson's Hygrodeik from 1866 until the early 1890s.

Ref: William Edson, "Hydrometer," U.S. Patent 48620 (1865), as well as similar patents in England and France.

William Edson, The Use of Edson's Hygrodeik (1865).

Date Made: ca 1866-1895

Maker: Lowe, Nathaniel M.

Location: Currently not on view

Place Made: United States: Massachusetts, Boston

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

Exhibition:

Exhibition Location:

Credit Line: Cornell College

Data Source: National Museum of American History

Id Number: PH.329004Catalog Number: 329004Accession Number: 278100

Object Name: psychrometer

Measurements: overall: 13 in x 8 1/2 in x 3 1/8 in; 33.02 cm x 21.59 cm x 7.9375 cmpart: 3/4 in x 8 1/2 in x 3 1/4 in; 1.905 cm x 21.59 cm x 8.255 cmoverall: 13 in x 8 1/2 in x 3 1/8 in; 33.02 cm x 21.59 cm x 7.9375 cm

Guid: http://n2t.net/ark:/65665/ng49ca746ae-0e51-704b-e053-15f76fa0b4fa

Record Id: nmah_1167522

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