C i6 $ ] 
XXIX. An Account of the \ Tranfit of Ve- 
nus : In a Letter to Charles Morton, 
M. D. Secret. R. S.from Chriftian Mayer, 
S. J. ‘Tr (inflated from the Latin by James 
Parlous, M. D . 
Read Feb. 4, T Return you many thanks for the great 
1 7 6z ‘ j[ trouble you have taken in procuring 
Mr. Dollond’s telefcope for me ; which, happening 
to arrive very opportunely the day before the obser- 
vation, gave great pleafure to our Serene Ele&or : a 
very happy invention which England alone was ca- 
pable of producing ! but at it’s coming to my hands . 
I had no lmall concern, for fear all our apparatus 
fhould be rendered vain, as it was conflant rainy 
weather. 
A fquare mount of folid ftone which had been 
made into an arch, in the Electoral garden at Schwe- 
fmga by his Highnefs’s order, afforded us a bafis 5 
in the middle of which another mount of like form 
was raifed five feet high, which Supported the agro- 
nomical quadrant : both were covered with a move- 
able covering, the building being carried round tnem. 
Two other fmall buildings of the fame conflrudion 
flood near this 5 in one of which IVli. Dollond s tel— 
lefcope was placed, and in the other the clock; hav- 
ing fo eafy a communication with one another, that 
a glance of the eye commanded them all. 
The aftronomical quadrant, which was ai. feet ra- 
dius Paris meafiire, was made in the year 1758, at 
Paris by M. Carinivet mechanical operator to the 
Vol. L 1 V. Y Royal 
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