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mounted on a brafs paralladlic machine exadtly 
divided. There likewifewas a micrometer with filk 
threads adapted to this inftrument, which was moveable 
every way, in fo much that it was eafy to place it 
according to the fun’s parallel, and to meafure with 
great facility the folar diameter, as well as the diftances 
of the cufps, and the parts of the fun which remained 
uncovered. To make the obfervation of the begin- 
ning, I had determined, by means of the micrometer, 
the point of the folar limb, where the contact was to 
happen. This was a little lower than the fun’s dia- 
meter parallel to the equator; the point of contadf 
was not diftant from it above 2' 30", and the time 
was exadtly 5 11 43' 50" true time. Mr. Jeaurat, 
who obferved in the fame obfervatory with myfelf, 
judged the beginning 3 later by a refradtorof 5 feet 
focus. 
Here 
