MICROMETER MEASURES. g^ 



n^f A T70A Q Tir ^ SemidiameteisofO'as given Observations 



Oct, 4, 1794. i>. Dr. 0. in the Nautical Almanack, of the sun's 



D. O. G. Micr •) 16'. S",76-\ diameter. 



WireMicr f 16'. 4M ( 



•) 16'. S",7€ 



f 16'. 4",1 



) 16'. 3".0 



Oct. 6, - ^'''' 3''^ 



Sej^tant 3, 



The wire micrometer measures, taken from this time till 

 the next vernal equinox, are omitted; inasmuch, as being 

 taken nearly in a vertical circle, the excess of the effect of 

 refraction on the sun's L. L., required a correction from the 

 tables of refraction ; which is liable to some degree of un- 

 certainty at low altitudes. They were found, however, to 

 ?gree very nearly. 



Pec. 14. By a set of measures of the sun*s diameters, on 

 the limb and arch of excess, taken, with great 

 care, parallel to the horizon, images extremely 

 distinct, and no discernible spring whatever in 

 the index. 



Dec 

 P 



©'sS.Dr, 4- 3" =7 16".18",0 > 

 ec. 15, V y 



. O. G. Micr, j 16'. 17",833 



S»midiameters of O, as given 

 in the Nautical Almanack. 



Pec. 29 



tJec. 29 



D. 6. G. Micr 7 16' 18",9 1 ., ,^„^ 



Sextant f 3", . j 16' 18",0 j ^ • ^^ '^V 



Feb. 16, 1795. 

 p. 0„ G. Micr. , 



0„ G. Micr •) 16'. 13",457 



3et of good observations ^ V 16'. 13",' 



>vith sextant, J 16'. I3",0 j 



