256 



TENTH ANNUAL REPORT OF 



If, as in Fig. 6. on this page, we find the index at 29 inches 3 tenths 

 and 5 hundredths, 29.350. 



If, as in Fig. 7, we find the index at 30 inches no tenths 5 hun- 

 dredths and something more, this additional quantity we shall find 



Fig. 7. 



by looking up the vernier scale until we come to some one line on it 

 coinciding with a line on tlie other scale. In this instance it is the 

 line marked 2, and indicates 2 hundredths, to*he added to the other 

 numbers, making 30.070. 



