146 



DYNAMIC METEOROLOGY AND HYDROGRAPHY. 



The chart of fig. 102 is on a scale of 1 : 10 000 000. Thus 1 centimeter on the 

 chart represents 100,000 meters. As the centimeter is the unit length on our divided 

 sheets, we see that by using them for measurements on our charts we express hori- 

 zontal distances in a unit length of io 5 meters. 



(A) Areas of unit vertical transport. We draw the curve C, fig. 103, and divide 

 it into elements which give v'dn' = 5. (The value v'dn' = i would have given too 

 narrow bands for a good construction.) Through the points of division we draw new 

 lines of flow which define the bands of flow to which the transport shall be referred. 

 On the chart which represents these bands we have also copied the curves of 



f/ fS 



Fig. 102. Lines of flow and curves of equal wind-intensity, U. S. A., 1905, Nov. 28, 8 a. m. 



equal wind-intensity from the preceding chart. We then perform the measurement 

 of the breadth dn of the bands, using the divided sheet of fig. 86. The chart of 

 fig. 104 gives the curves for equal values of these breadths, together with the lines 

 of flow copied from the preceding chart. The graphical multiplication of the field 

 of dn by that of v finally gives the field of transport T lt which we have represented 

 on the chart of fig. 105 by the following curves 



T, = . . . 6, 5, 4, 3, . . . 

 The chart which we have obtained in this manner will represent the horizontal 

 transport in a sheet the thickness of which is given by unit decrease of pressure from 

 the ground to the upper limiting surface of the sheet, and at the same time the 

 vertical transport through this upper limiting surface. 



