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Johnson's natural philosophy and key to philosophical charts : illustrated with 500 cuts; being reduced photographic copies of all the diagrams contained in the author's philosophical series of indestructible school charts ; for the use of schools and families (1878)

Johnson, Frank G., 1835- · Chicago, A.H. Andrews · leaf 169

An illustration from Johnson's natural philosophy and key to philosophical charts : illustrated with 500 cuts; being reduced photographic copies of all the diagrams contained in the author's philosophical series of indestructible school charts ; for the use of schools and families, 1878, leaf 169
120° F. 268. General direction or frequency of different winds. —In the Table the relative frequency of different winds is given, thetotal number of winds in each country being 1,000. FREQUENCY OP DIFFERENT WINDS. COUNTRIES. N. N. E. E. S. E. s. s. w. w. N. W. England ..... France Germany Denmark… … 269. Figure 13.—Anemome-ters.— Pressure of -winds.— Anemometers, of Avhicli there aremany kinds, are instruments formeasuring the pressure and velocityof winds. The anemometer here shown con-sists of a tube, open at both ends,bent in the form of the letter U; theend of one arm being bent to…

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