[ 293 3 
We were now enabled to furnifli the Norriton 
obfervatory, as follows ; 
1. A 2^ feet Gregorian refledlor, with a Dollond’s 
miciometerj made by Nairne, its magnifying 
powers 55, 95, 135, and 200 times. The gift of 
the honourable Thomas Penn, Efquire, to the 
College of Philadelphia. Ufed by Dodor Smith, 
2. A refrador of 42 feet, its magnifying power 
about 140. The glaffes fent to the Affembly, 
with the large refledor, from England. Ufed 
by Mr.Lukens. 
3. Mr. Rittenhoufe’s refrador, with an objed 
glafs of 36 feet focus, and a convex eye glafs of 
3 inches, magnifying about 144 times, Ufed 
by himfelf. 
4. An excellent clock j a tranfit tclefcope, nicely 
moving in the plane of the meridian ; and a 
very accurate equal altitude inflrument, fup- 
ported, in the obfervatory, on a hone pedelfal. 
Thefe three articles were alfo Mr. Rittenhoufe’s 
private property, and made by himfelf, whereof 
fome mention is made below. 
5. An aftronomical quadrant, 24 feet radius, made 
by Sidbn 3 the property of the proprietors of 
Eaft New Jerfey j under the care of the right 
honourable W^illiam Earl of Stirling, furyeyor- 
general of that province, who kindly permitted 
us the ufe of it. 
nothing being defired here but the contads, and their exad 
time, which he obtained to great fatisfadion, as by his report 
may appear. 
As 
