16 



y ■ ° >91 67.95 018 + Wsk i73 ' r ~ 2 x 1 ' 24 x U + 1 ' 2) x 10 ~ 6 

 = 0.000241 + 0.000428* = 0.000669* 



p = 0.00812 x 2,12 q 91 1 ° x 0.000669* = 12.7* kg. per sq.cm. =12.3* atm. 



^Translator's Note: This value of p is too high since n = 9 is determinative 

 instead of n = 8. Using n = 9, /° = 0.109, /*,= 1.19, fc = 1.1 



y = Q-91^0.0119 + ^ (90>9 3 _ 2 x 1>19 x 81 + 1#1) x 10 -« 



= 0.000127 + 0.000522 = 0.000649 

 p = 0.00812 x 2<12 q 9i 1 ° x 0.000649 = 12.31 kg. per sq.cm. = 11.9 atm. 



The use of equation (a') gives 



~ - 2.60 x 2.125 x 10 6 x (0.00406) _ 19 ,. . nQT> en m _ „ Q . 

 p = ^ — 12.31 Kg. per sq. cm. = 11.9 atm. 



0.5 - 0.45 y 0.00406 



It will be noted that Eq. (a 1 ) gives the correct collapsing pressure independent 

 of the number of lobes, while the use of Eq. (6) with an incorrect value of n 

 gives a collapsing pressure which is too highj 



(2) (0 = 0.0896* /U, = 1.16 ^i =1.1 



y = 0.91^0.00803* + 5^21 (70#3 3* _ 2 x 1.16 x 64 + 1.1) x 10" 6 



= 0.000110* + 0.000398* = 0.000508* 

 p = 0.00812 x 2,12 q o-j x 0.000508* = 9.63* kg. per sq.cm. = 9.3* atm. 



[Translator's Note: The use of Eq. (a*) gives: 



~ - 2.60 x 2.125 x 10 6 x (0.00406^ _ Q „ Va naT1 on „ m _ Q . B . ~| 



p 0.625-0.45 V 0.00406 ' " 9 * 73 kg ' per s<i ' cm ' " 9A atm J 



(3) ,0= 0.0820 ^,= 1.13 ^=1.1 



y = 021^0067 + ^ (53.4^-2x1.13x49+ 1.1) x 10" 6 



= 0.000121 + 0.000300* = 0.000421* 

 p = 0.00812 2>12 q oV x 0.000421* = 7.98* kg. per sq.cm. = 7.7* atm. 



