Cup Anemometer 



7 



It is noted that this simple expression does not take into account the sheltering of one cup by 

 another, although such shielding may be considerable, especially ina system where d/D approaches 

 unity. 



Then if V a is known, h and k can be evaluated from the experimental results, for each par- 

 ticular anemometer, by the method of least squares. Table I shows the values of h and k, evaluated 

 from the test results, for different dimensions of cups and for different values of the "dissimilarity 

 factor" d/D. These values are plotted against d/D and its reciprocal in Figs. 3 and 4 respectively. 



Table 1(a) 

 Values of h and k Obtained from Marvin's Data 



