Geography of the AirGreely, A. W. (Adolphus Washington)
Science
Geography of the Air
Greely, A. W. (Adolphus Washington)
Geography; Meteorology
Your Vice-President has elsewhere expressed his opinion that monsoon
winds, applying the term by liberal construction to signify winds
which recur with returning seasons, cannot with {48} any degree of
correctness be asserted to prevail in the United States. It is true
that the prevailing surface winds of the greater part of the United
States come from the western quadrants--that is, between southwest and
northwest--and so are in substantial harmony with the general
atmospheric circulation as shown by the upper-wind currents of Mount
Washington (from the northwest) and Pike's peak (from the southwest).
But, apart from the easterly and northeasterly trades on the Florida
coast, it appears from the records that in no case for any
considerable section of the country do 50 per cent. of the winds blow,
for any consecutive number of months, either from any single point or
from two neighboring points of the compass. Occasionally, however, the
local configuration of the country is such that winds are drawn up or
down valleys, and, being diverted from their free and proper
direction, the wind in such cases follows the trend of the valley or
depression.
* * * * *
In general your Vice-President would feel inclined to refer only
casually to the work proceeding from the Bureau over which he has the
honor to preside, but this year has been marked by special researches
and investigations of general interest. As the work of investigation
has been entrusted to the professors of the Signal Service, due credit
should not be refused them from their own official chief.
Special reference should be made to the work of Professor Charles F.
Marvin, whose successful experiments on wind pressures and velocities
have attracted the attention of experts both in Europe and in this
country. Unfortunately there was available only a small sum (about one
hundred dollars) for the expense of experiments, but with this petty
sum, supplemented by his ingenuity, Professor Marvin has very
satisfactorily determined the coëfficients of the various forms of the
Robinson anemometer, with which instrument the velocity of the wind is
very generally determined. Following these investigations, the Royal
Meteorological Society of England reopened the question, which, after
a costly set of experiments with results widely differing from those
of Professor Marvin, had been considered closed.
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