I0I 5 
Solar Eclipfe , June 24, 1778. 
Off the fcale, 
or before 0. 
On the fcale, 
or after 0. 
inches. 
Ver. 
inches. 
Ver. 
0,05 
4 
0,05 
11 
0,05 
4 
° 3 °S 
11 
0,05 
3 i 
°j 05 
12 
0,05 
4 i 
0,05 
I 2 § 
0,05 
5 
0,05 
15 
0,05 
4>3 
o>o5 
12,3 
o 5 o 5 
4,3 
0,00 
8,0 
Mean on the fcale. 
Mean off the fcale a 
Difference, - 
Half the above difference, or four divifions of the ver- 
nier, = 4", 8 3 , is the error of the micrometer, to be fub- 
trailed from the meafured diftances of the cufps, and 
alfo from the diameters of the Sun, taken near the mid- 
dle of the eclipfe, in the fame direction with the chords 
which were meafured about the fame time : and, this di- 
rection being nearly vertical, thefe meafurements will, 
in fome degree, be affeCted by refraCtion ; but they may 
readily be corrected if the altitudes of the Sun be com- 
puted to the times when they were taken, and from 
thence the effeCt of the refractions » . 
1778*, 
