306 Mr. Hoyt on the latitude of Deerfield. 
19th; but the eclipse happened so near to noon on the 17th, that the 
difference is but very small in using the rate indicated by the obser- 
vations of the 17th and 18th. The beginning comes out nearly the 
same by both ways of computation, and the end hardly differs 2”. 
The mean of the results are 
Beginning of the eclipse _ OA. 45’ 37” apparent time. 
End 3 50 33 do. 
The unobscured part of the sun at the middle of the eclipse was 
10 divisions of a micrometer, the whole diameter being 90 ; hence the 
eclipsed part of the sun was 103 digits. 
2. Results of observations for the variation of the needle. 
The azimuths of Sirius were observed with an accurate compass 
of the Rittenhouse construction ; the other azimuths and altitudes were 
taken with a theodolite, furnished with an excellent telescope, sie 
level, and vertical arch, made by W, Jones, London. 
Time of obs. Obs.azimuths. Truealt. Object. Variation. 
1811 Sept. 16 S 46°45’'E 37°15! Sun 5°33! 
Oct. 18 N 620W i1 10 Alioth 26 
Nov. 15 N 153 51.E 22 51 . Sun 33 
a 'N 154 28 E 23 08 Sun 24 
1812 Feb. 1 N130 45E 11 25 Sirius 27 
spinnin N131 30E 12 05 pas 20 
—— N 182 30E 12 38 — 36 
—— N 133 OOE 13-05 — 32 
— N138 35E 13 36 — a3 
Mean variation 5 28 W 
8. Results of observations for the latitude of Deerfield. 
These observations were made with the sextant. The index ’er- 
rors were determined by measuring the sun’s diameter. 
