-C^r^^lTE MERIDIAN. '43 



Fy the comparifons made at Hydrabad, the old chaia 

 with which the meafarement was made, exceeded the new 

 one .01756 feet,and the newer itandard chain exceeded the 

 3 00 feet by the brafs (tandard ,01574 feet. Then- 

 501755 X ,01574 = .03330 feet, for the excefs of the old 

 chain above 100 feet^. Therefore 308 x 100.03330 feet will Tee?, 

 give the length of the Bafe. .. , > » . , ,. .. . , 30810.25.54. 



At the conclusion, the eld chain exceeded the new one 

 45,63 div^ifions of the micrcm.eter equal ,01828 feet, and had 

 therefore increafed by v/ear ,00072 ft. Hence 308 + ——^ 

 = ,iio88feetj the correction for the wear, which add, . « xciio^ 



The fum of the deductions- (from col. 4th) is 3.93380 feetr, 

 which being increafed in the ratjo'of 100 to 100.03330 feet^. 

 will give, 3,9372 feet, which fubtradl . — .T5937^- 



Hence the apparent horizontal di (lance, will be , , 30806,4,301 



The correction for the expanfion, and reduc* 

 ed to the Itandard temperature of 62^ will be^ 



so- CO' 



(83,n'3— io)x,0074 — (62 — 5o)x, 01237 „ o r^ r C ± 7 " U 



-^^—^ — '-^ — ^^ — :^= 308. 06030 1 — 2,6352-- feet, which- 



aad, .,-*•• ^. .. • , e « • ♦•».#• -^-2,635;^- 



Hence the corrededfmeafure of the Bafe for the temoe- 

 lature of 6^° will be - ,. » . ,. ,,...,. .- ,. 30809,0653; 



» 



Which being reduced to the level of the Tea, by taking 

 the mean height of the Bafe above that level to be 1917 feet, 

 we have for the whole length of the Bafe, ... » 30806,2375: 



N. 



