410 PRACTICAL MATHEMATICS 



diagonal line of differences to be used would be the one going 

 downwards from U Q . Or taking it another way, u 3 could be 

 denoted by u , then w 2 . 4 could be taken as w_ . 6 and the diagonal 

 line of differences to be used would be the one going upwards 

 from u . 



As an example of the application of the method of finite differ- 

 ences to interpolation, let us work with the following values of 

 and p where is temperature in C and p pressure in pounds 

 per square inch. 



140 52-52 



The values of A 3 p indicate some slight irregularity, and this 

 might be due to the fact that and p are experimental results ; 



