113 



1795. 

 March 50"^ and SP'. Day very favourable; various sets of measures 

 taken with divided object-glass and wire micrometers. 

 The extremes of the divided object-glass micrometer 

 measures never exceeding 1''. Those of the wire 

 micrometer 0; 



s. D'. ©. 



D. O. G. Micr'. '^ 16'. 2",45 } 



* Wire Micr^ 5l6'. l",9 i 



June 8*. The two different micrometers were applied to the 

 42-inch achromatic telescope, and the scales verified. 



Semidiamttera of 0> ai givca 

 in the Kauticftl Almioaek* 



Same day, D. O. G. Micr'. 7 15\ 46",95 > 



> > 15' 4.8^' !• 



Wire Micrf. 5 15'. 46",45 5 '^ ' ^'^ ' '* 



June 9, D. O. G. Micr'. > 15'. 46",95 > . „ 



/ ' 15 48 '0' 



Troughton's sextant + 3",} 15'. 48",0 5 • ' ' 



June B, D. O. G. Micr'. > 15'. 45",9 > 



> I 15' 47" 4 



Wire Micr. 5 15'. 46",7 i ' ' 



* This cartation of tbe sun's semidiameter is the eflFect of the difference oC 

 refraction of the L, L. of the sun from the upper. 



