, . f 295 ] 
papers) into a fmaller compafs, as I would have 
done myfelh .f I had known how. I beg you 
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it 
“ ^ great efteem and afFedion, Yours, 
No»o„.j„,,.s..;6,. Davzo Rittenhouse.” 
Mr. Rhtenhoufe’s account of the obfervations made 
y him, at Norriton, before and after the tranfit of 
Venus, June 3, 1769; for determining the lon- 
his dock,'lc'““‘“' regulating 
“ Early in November, 1768, I began to ered an 
obfervatory, agreeable to the refolutions of the 
Am,.ncan Philofophical Society ; but, through 
vanous difappointmems from workmen and wcl 
ther could not conrplete it till the middle of 
pid, 1769. Ihadior fome time expeded the 
‘ an equal altitude inftrument from Philadel- 
TlfeU I could not depend on having 
f.i .“"^‘on as I could contrive. It has a good 
zon tal and^ ‘“ri- 
ontal and one vertical wire, in the focus, and is 
very eafily adjufted to a plummet wire, 4 feet in 
length, by two fcrews ; one of which moves it in 
dirc-ffion"‘^Ti?’ '‘u -ft 
diRdtion. The 20th ot March this inftrument 
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