456 Mnjor-General Roy's Account of the 



tliat of glafs being taken into the account, it appears, that the- 

 fmall expanfion * of the deal rods from the humidity of the 

 iair, muil, at this point, have exceeded what it was eftimated 

 at in the general table by 0.931 of an inch, fuppoiing no error 

 of any kind whatever to have arifen in the execution, froni 

 bringing the rods into contaft, or otherwife. 



On Saturday the 21 ft of Auguft, the meafurement was^ 

 refumed at the thirty-ninth ftation, and continued for five hypo* 

 thenufes to the thirty-fifth inclufive. 



This day, about noon, hi^ majesty deigned to honour tha- 

 operation by His prelence, for the Ipace of two hours, enter- 

 ing very minutely into the mode af condu<5fing it, which met 

 with HIS gracious approbation. 



On Monday the 23d, the menfuration was farther continued 

 for five hypothenufes, that is, to the thirtieth inclufive. 



On Tuefday the 24th, we proceeded with the meafurement 

 for the fpace of feven hypothenufes, finifhing the bulinefs o£ 

 the day at the twenty- fecond ftation,. 



* 155 deal rods 

 =33100 feet 



In. 



r -f 0.383 for I® excefs of ternperatiSre of the brafs fcale froiij, 

 62'' to 63°. 

 -J- 0.651 proportionable part of th& eftimated expanfion froiri' 



h>umidity.. 



1.034 equation of the deal rods on 3100 feet,. 



I' +2.3UI lor o excels or tne near or -tae crais icaie iroiB' 

 62" to 68^ ^i| 



,- s, —0.4.56 obferved contraction of the dafs from the nth an^ 

 •-3i00teet J ^^ . , r -.u . ui 



*'• j 1 2ih columns ct the table. 



I +0.100 by which tbe 155th rod fell fliort of the thread. 



4- 1.965 equation of the glafs rods on 3100 feet. 



f Difference of the two equations, undfer-rated in thfe 

 •yS I I exnanfion of the deal rods-. 



It 



