Ixxx Table* for Statuticiaiu am/ /*o/wric/a//* 



need of such a table is very obvious, au.l ari,s in too great a variety of circum- 



stances to be specified. 



Illiutnttwii. It is rv.,uire.l to plot th.- .-urve: 



* = 14-99 17 tau 0, 



Here log y = log 235'323 + 32-8023 log cos 6 - 4'5696 log x 

 To cover the whole range of observations we must proceed fimn, ' - - Mo 

 rouehlv It will be found sufficient to take by ^te* 



* 



and multiplying by the logarithmic cos.nes of 36 9 rt^ 

 obtained by multiplying (taking the third factor from Tabl 



4-5696 x log e x -017,4533 = '216,7955 

 on the machine and multiplying the result in succession by 3, 6, 9, etc. 



jj j i i OQKQ91 9-171 fifi44 and the second column 

 The first column is added to Iog23532-i- m,uc 



Another problem sometimes arises given x to find y For 



= - 2-0885. Required to find the maximum ordmate yma . 

 tan 6 = - 2-0885/14-9917 = - '139,3104, 



whence by a table of natural tangents 



= - 7 55' '851265, 

 = - r 55' 51". 



The log cosine of this value of Q is 



1-995,8962. 



Table LIII gives us : 



r= -122,1730 m are 



.,., = -015,9989 



851,265' = -851,265 x "000,2909= -000.2*76 



Hence 0= -'138,4195 



See PWI. Tran,. Vol. 186, A, p. 387. Pearson's Type IV frequency curve fitted to the .Utur. 

 of 2192 St Louis School OirU aged 8. 



