386 



PROCEEDINGS OF THE AMERICAN ACADEMY 



Since for 16°. 67, 



For the Meter, 



i?,«'-+ 2.8^ = A 

 H^ — 18.6 fjL = Gj 



a? 



Mf — 2\.Q^= Gf 

 we have, finally, 



G,""" -{-2lAii = A 



G.f -\- 2Z.% ii = A 



For the Yard, 



and Rf — 1.4 ;t 

 Rf'— 18.4 ;t 

 R^ — 18.3 y. 



Gf + 17.0 ft 



= T 

 = G, 



T 



dt 



a> 



G^-^l%.^t>.=: T 



The Tallies which were acttrally nsecT in the subsequent transfers, 

 derived from a few of the earlier observations, were 21 ^ for the meter 

 and 15 /A for the yard. 



It will be seen from the following observations that the second 

 transfer was not quite successful, although the magnitude of the 

 residuals is very much reduced. This part of my labor will not be 

 considered as completed until a third transfer has been made, and until 

 advantage can be taken of a lower temperature during the coming 

 winter in order to obtain a more accurate value of the coefficient of 

 expansion of the glass bar. 



In the following tables, the values of R^' — G, 

 have been reduced to Rf" — G^'^^ and R^' — .^2 

 — 0.9 div. and — 1,7 div. for the meter, and — 0.8 div. and -f-O.S div. 

 for the yard, respectively. 



COMPARISON OF METERS B.^\ G-^\ G.^^--^ AND C/i^s WITH ONE- 

 INCH OBJECTIVE. 



2 and of i?j 



G^f^ ^ by applying 



C/^ 



