vi TENSION REQUIRED TO RAISE THE SAP 137 



grammes transmitted per second, 1 = length of wood, and 

 K = average value of the product Ml observed. The 

 observations, it may be seen, approximate fairly closely to 



10 15 



Cms. long 



Fig. 22. 



20 



25 



this curve. When the weights of transmitted water are 

 plotted against units head the curve shown in Fig. 23 is 

 obtained. Here the proportionality of flow to head, or, 



70 



GO 



50 



a> 4-0 



30 



20 



10 







' 



f 



T 







4 fa 8 10 12 14 16 18 20 



Units Head 



Fig. 2: j . 



rather, the inverse proportionality of flow to length, is 

 immediately apparent. Up to 10 units the curve is 

 almost a straight line. The bending over which occurs 



