VOL. LIX.] PHILOSOPHICAL TRANSACTIONS. 643 



south, 56° west from Quebec, distance from the castle of St. Lewis 2-l miles, 

 with Bird's astronomical quadrant, the latitude, viz. 



Zenith angle of the sun's upper limb 51° 4' O" 



Deduct for the sun's southern declination .... 4 34 31 



Remains 46 2g 2Q 



Add the sun's semidiameter l6 Q 



Ditto refraction 1 42 



North latitude by observation 46 47 20 



Eight more observations of the latitude were also taken by the same; the 

 mean of all giving 46° 47' 15* for the latitude north. 



Obs. of long. March 1 1 , 1769, observed by the same at the same place, with 

 Dollond's refracting telescope, an immersion of the first satellite of Jupiter, at 

 15 hours, and 45 seconds, mean Or equal time. Several more similar observa- 

 tions were also made. 



Obs. of the tran. June 3, 1769, observed by the same at the same place, with 

 the same instrument, the transit of Venus, as follows: at i"* 28"" I-l' perceived 

 a luminous point on the lower part of the sun's limb, by appearance; and in the 

 same place l-^' afterwards, the first external contact was formed, which rectified, 

 as the clock or time-piece of Graham was 15' too fast at the time of observation 

 (as proved by equal altitudes of the sun taken with Bird's astronomical quadrant, 

 on the 1st, 2d, 4th, and 5th instant) the equal or mean time of observing the 

 first external contact will be at 2^ 27™ 48'. Mr. St. Germain, of the seminary 

 of Quebec, observed the same contact, at the same instant, with Short's 2-feet 

 reflecting telescope. Clouds, intervening, prevented the observation of the first 

 internal contact ; but at 6 o'clock the planet might be seen with the naked eye 

 on the sun's disk, through the haziness of the atmosphere. 



Obs. of lat. January 2, 17 68, observed by Ensign George Sproule, of the 

 59th regiment of foot, on the south point, at the entrance of the basin of 

 Gaspee, with Hadley's quadrant, and an artificial horizon, the latitude, viz. 



Double angle of the meridian altitude of the sun's centre 36° 38' O' 



Apparent altitude of the sun's centre 18 19 O 



Refraction 2 4 



True altitude of the sun's centre 18 16 19 



Taken from 90 O O 



Sun's zenith distance ..71 43 41 



Sun's declination reduced to the meridian of Gaspee 22 56 10 



North latitude by observation 48 47 31 



There were 14 more observations made of the latitude, by the same person ; 

 and the result of the whole 15 make the place of observation 48° 47' 32" north 

 latitude. 



4 n2 



