sG MEASUREMENT OF AM. ARC', 



So that the length of the chain is now 



Oct. 2 2d.— Thebrafs meafurs was-raade at the temperatiire 

 oi'Gs'^, ^^■- *^^ chain was cosupared at the temperature , 

 of 67°',. and exceeded by a'4',4:6S6- r. or 



But 2°x,oo742 inches or ,014.845,. in which the chain had 

 lensthened fmce the b^afs raeafure was laid off » 0,01 



The difference of v/hich is,.tliie excefs of the chain at the- 



INCHESt.- 



tennperatare of 65® or . = ,»■=.■■- ,11801. 



To which add. i,5'^x5Q0495:inches, or- =. » - - ,07422 5: 



Their fu.m,; will; be what- the chain lias, lengthened, or- » ^^ 9^^^" 



FEET. 



Henee the leogt-h of the cb-ain is - °- » - ioo.O'oq^,:: 



'Oct. 23d.— The brafs oieafure was laid o;8^ v^^hen the tem- 

 perature was 65. 1° and the chain was compared when the 

 temperature was 65 ,7 ^-5 and then exceeded the 100 feet by- 

 20,89166 r/ or - =» " o 11344 :■ 



From which dedusS: Q,§." K.,00742 inches, or »- - 0,00445 



The duTerence is the excefs at the temperature 65,1® ^ <- 0,10899-, 

 To which add 15° .1 x ,00495,, inches, or - 0,07474, 



The Turn is what the chain had lengtheneci> • «- ^- 0,18373- 



And the length of the chain is , I 100.015 31 



Hence we have the length of the ftandard chain as follows : 

 By comparifon, 2i.f^, at 65,1^ temperature ^, . , 100,01589 



22d, at 65, ^ » » 0- "■ ,oi6'>2 



23d, 2it6^,l°- . *. » • 



Mean, or length at temperate 65, 07®. « feet 200, -;?j 



