ON THE MERIDIAN. 319 



Therefore 326x100.0218 feet, will be themeafure In raT ° 



terms of the new chain equal -----..------- 3 a ^°3 9 97°f 



At the conclusion the old chain exceeded the new 

 one 38.27 divifions of the micrometer And had 

 therefore increafed 7.86 divifions, equal to .00315 

 feet. Hence 326x oo °3 '5— 0.5133 feet, the correction for 

 the wear, which add ---.-----... +0.5133 



The fum of the deductions from col. 4th, is 0.43673 

 feet which being increafed in the ratio of 100.01218 feet 

 will be 0.43678 which fubitraft • -...... — 0.4368 



Hence the apparent horizontal diftant will be - - - 32604.04721 



The correction for the expanfion and reduced to the 



o 00 



itandard temperatureof 62 will be T B 



^32604.0472. will be 5.4429 feet, which add - - « ■. +5.4429? 



Hence the corrected meafure of the bafe for the tern- 



D 



peratureof6a will be ------ 32609.4904 



Which being reduced to the level of the fea by taking 

 the mean height of the bafe, and which is 1 181*5 feet 

 above the level of the fea will be -------- ~ 32607.6000 



