USE OF TABLES. 



71 



As another example, suppose the value of t to be 

 1-51209. 



When t=l'51, H = . 96728 

 24 



When t = 1-5 1209, H= '96752 



209 



1026 

 228 



23,826 



We shall now take the inverse problem, and sup- 

 posing H to be intermediate between two values in the 

 table, require the value of t. For instance, let H = 

 93972. 



RULE. 



Find in the table the value 

 of H next below the given 

 value ; note the corresponding 

 value of t, and subtract the 

 nearest value of H from the 

 given value. 



Annex three ciphers to the 

 difference just found, and di- 

 vide by the figures of the dif- 

 ference in the table which 

 come before the blank space, 

 rejecting fractions, and taking 

 the nearest whole number. 



The quotient cannot have 

 more than three places : if 

 three, annex to the value of t 

 already found; if less than 

 three, place ciphers at the be- 

 ginning to make up the defi- 

 ciency, and annex. 



EXEMPLIFICATION. 



H -93972, 

 next below 1 . 93807t = 



> *Q 



in the table J" 



165 

 Tabular diff. 195. 



195)165000(846 

 1560 



900 

 780 



1200 

 1170 



30 

 t=l'32 846 



F 4 



