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SPECTACLES, &c.-The subscribers, Manufac-
~ turers of Mathematical, Optical, and Philosophi
cal Instruments (at the solicitation of their friends


have added to their establishment The article of Spec


acles, in every variety of forms, where glasses of
the best quality, and correctly ground on optical
principles may be had to suit the sight Of (neary) all
persons; gold frames made to ORDER Of any pattern


glasses fitted to old frames, and all work in the line
done in the best manner; where may be had great


" to $780, Engineers and Surveyors Instruments of
superior quality, Pocket and other Telescopes spe-
rior Thermometers, in mahogany cases, for halls or


parlors, Barometers, &c. Shortly will be published,
in pamphlet form, with plates an Essay the Human
Eye showing its defects, and explaining the appca-
| ton OF Optical Glasses, to its assistance &c.


PATTEN & SON,


South side Pennsylvania avenue, x
nov G--lm between 10th and Ilth sts