[ 280 ] 
filver, or any other fluid, which is fheltered from the 
wind by two glafs lides inclined to one another, and 
ground truly plane: this lafl: for taking the Sun’s 
double altitude by refledion with the Hadley’s fextant. 
Bv a more accurate calculation of the times than 
j 
Mr. Wright has ufed, I find the equation of corre- 
fponding altitudes, for the noon of June i to be — 5'',Q, 
June 2— 4^,5, and June 3 for midnight -(-q'hb. 
rience the true time of noon, by the clock, June i, 
was 12^ 19' 10", o; June 2, 12** 18' 2o'',oj and 
June 3, midnight, 12*^ 17' j and hence the 
true time of noon, June3, fhould be 12^ 17' 34^^i» 
and the clock is lofing 46'^ per day on apparent 
time. Hence the apparent times of Mr, Wright’s 
4 obfervations will come out as follows: 
App. time, 
h > n 
2 31 53 vlfible impreffion made by Venus yet. 
2 52 56 Venus had made a fmall impreffion. 
2 50 19 Venus appeared completely round to the eye, and rather de- 
tached, and joined by a ligament. 
2 50 50 The rays of light appeared at the internal contaft. 
Taking Ifle Coudre to bear N. 41° 30' Eafl: from 
Quebec, diftant 55 (latute miles, as, Mr. Wright 
lays, was found by an adual furvey ; the diflance in 
geographical miles is 47,65. Therefore the place 
of obfervation is 35' 41'^ north of Quebec, and 
31' 34'^ eafl: of it, =; 46' difference of longitude, 
= 3 6'" of time.' 
XXKVIII. Ex- 
