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Modifications of the float of the dines anemometer to increase or decrease the range of velocity
Author(s) -
Gold E.
Publication year - 1937
Publication title -
quarterly journal of the royal meteorological society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.744
H-Index - 143
eISSN - 1477-870X
pISSN - 0035-9009
DOI - 10.1002/qj.49706327109
Subject(s) - anemometer , float (project management) , range (aeronautics) , mechanics , meteorology , wind speed , materials science , physics , engineering , marine engineering , composite material
The range of velocity which can be recorded by the Dines anemometer can be increased by putting weights on the float. The maximum range of the Dines anemometer with a float of normal weight is 122·5 m.p.h.; this can be increased to 137 m.p.h. by weighting the float so that its maximum height will be 15·4 cm. (6 inches) above its zero level. These limitations are due to the fact that at these velocities air from the inside of the float begins to bubble through to the space in the container outside. If the float is weighted so that it does not rise at all above the zero level, air begins to bubble through at a wind speed of 178 m.p.h. If an anemometer is required which will record on a linear scale velocities higher than 122·5 m.p.h., the dimensions of the float must be changed. This change can be made by altering the shape of the interior of the float and an increase of the range up to 150 m.p.h. can be obtained in this way without increasing the height of the container. If a greater range is required it is necessary not only to alter the shape of the float, but also to increase its length. The length of the existing float is approximately 47 cm. If this length is increased to 91 cm. and the necessary change of shape is also made, velocities up to 200 m.p.h. can be recorded. The paper gives the exact numerical dimensions of the float for these cases and for cases of a more open scale also.