anemometer, Dines pressure-tube type
Datecirca 1891
Inventory Number1998-1-0907
ClassificationAnemometer
Subject
Maker
William H. Dines
1855 - 1927
Cultural Region
Place of Origin
Dimensions27.5 x 26 x 16 cm (10 13/16 x 10 1/4 x 6 5/16 in.)
Material
DescriptionThe instrument consists of a glass tube with a linear wind scale attached to the side, marked with handwritten increments from 1-70 (nonlinear, with the intervals between numbers decreasing as they grow). The tube and scale are mounted on a rotating shaft attached to a circular base. The glass tube is topped by a pressure head; two plastic vanes angle out from either side of the pressure head. A spherical weight is attached to the rotating shaft by a horizontal support.
This one appears to be an early, experimental model.
This one appears to be an early, experimental model.
Signedunsigned
Inscribedhandwritten scale marked on panel attached to upright glass tube: increment lines labeled numbers "1...70," and
FunctionFrom the Glossary of Meteorology, American Meteorological Society (available here.)
Dines anemometer—A type of pressure-tube anemometer, named after the inventor, in which the pressure head is located on the windward end of the wind vane so that it is kept facing into the wind.
The suction head is mounted concentrically with the shaft, near the bearing that supports the vane, and develops a suction that is independent of wind direction. The pressure difference between the suction head and the pressure head is proportional to the square root of the wind speed and is measured by a specially designed float manometer with a linear wind scale. The Dines anemometer was first described by William Henry Dines in 1892 and had all the essentials of the final form of the pressure-tube anemometer. With various modifications, the Dines anemometer remained a useful wind measuring device into the 1960s.
Dines anemometer—A type of pressure-tube anemometer, named after the inventor, in which the pressure head is located on the windward end of the wind vane so that it is kept facing into the wind.
The suction head is mounted concentrically with the shaft, near the bearing that supports the vane, and develops a suction that is independent of wind direction. The pressure difference between the suction head and the pressure head is proportional to the square root of the wind speed and is measured by a specially designed float manometer with a linear wind scale. The Dines anemometer was first described by William Henry Dines in 1892 and had all the essentials of the final form of the pressure-tube anemometer. With various modifications, the Dines anemometer remained a useful wind measuring device into the 1960s.
R.W. Munro Ltd.
Date: 1887
Accessories: wooden case; key for case
Object number: 1998-1-0825
Blue Hill Meteorological Observatory
Date: circa 1892
Object number: 1998-1-0418a
A. Lawrence Rotch
Date: circa 1888
Object number: 1996-1-0137
Blue Hill Meteorological Observatory
Date: circa 1892
Object number: 1998-1-0418b
Crosby Steam Gage & Valve Company
Date: circa 1903
Accessories: instruction manual; letter from company; one gallon can of oil (2002-1-0100)
Object number: 1998-1-1618
