1 _i(100A//? -1) L,/R and l^/LM^. Here plots of constant values for p^^ appear as fami- 

 lies of curves intersecting along straight lines. These lines divide the graph into regions of 

 n = 2, 3, 4, and 5. A close estimate of the collapse pressure can thus be obtained directly 

 from this figure once the coordinates are known. For a more precise determination of j>^^ Fig- 

 ures 1 and 2 should be used after the appropriate value of n has been found from Figure 3. 



ACCURACY OF RESULTS 



In the construction of Figures 1 through 3, some scatter in the calculated points was 

 unavoidable, as might be expected. However, in only a few isolated instances was the dif- 

 ference between the graphical results and those from Kendrick Part HI as high as 15 percent. 

 In the great majority of cases, it was less than 10 percent. A representative set of results 

 obtained from Figures 1 to 3 is presented for comparison with Kendrick' s theory in Table 1. 



ACKNOWLEDGMENT 



The author is indebted to Dr. E. Wenk, Jr., at whose suggestion this project was initi- 

 ated, and to the members of the Applied Mathematics Laboratory for their valuable assistance 

 in programming the numerous calculations on UNIVAC. 



