{"character_count": 2382, "word_count": 407, "ccnet_language_score": [0.942799985408783], "ccnet_perplexity": [2278.0], "fasttext_language": ["en"]}
GPECTACLES-My attention mas oeen called to
~ article in the public papers and circulated in
handbills about this city called Perfocal Spectaces
said to be constructed in accordance with the phi
losophy of nature, IN the form Of ConcavoC Convex
Ellpsis What is meant by the philosophy of nature
may be hard to tell but certainly they at tvariance
from the laws principles Of Optics, as certainly no
Epsis converge the rays light to perfect TO-
Gus. They are said not to be the French menlscus
or Wollaston's periscopic Zone and the same con-
struction Of glasses.) The menscus lens is truly
ground surface concave side; the other side,
possessing greater degree Of phercity consequent
y becomes magnfying glass. This species OF glass
will converge the rays Of light the same as double
convex lens The application Of this form Of lenses
in the shape of Spectacles, gives the eye greater
field of vision.


The celebrated Dr. Brewster, in speaking Of these
Spectacles says that they give decidedly more iper-


feet visions than spectacles, because they in
crease both the alteration of figure and Of color but
they may be of use in crowded city in warning us
of the oblique approach Of objects. Now, as spec
tacles are intended to assist nature, and the Eye,
the most perfect masterpiece OF Divine Mechanism


Tin its natural state,) every part has the very form
perfect vision of object Is it not prcposerous TO
apply piece of bent concavc or convex glass with
out true form or figure to its assistance! On the con-
trary it not reasonable to conclude that their con-
tinued use would destroy the eye entirely? Specta-
cles are probably the most ancient of all optical in
sruments and yet has undergone the least change of
any. The subject has been well considered by Opti-
clans throughout all Europe for ages, and the general
conviction is that truly ground concave or convex
lens is the most suitable for assisting decayng or un-
natural visions Of the human eye. r. PATTEN.


The subscribers have for sale at their mandatory,
on Pennsylvania avenue, south side, between 10th
and 18th Streets general assortment of the best Of
Spectacles, with truly ground glasses. Glasses of
the best quality fitted to old frames, &C. Also, Sur
veyor's Compasses Levels, and Drawing Instruments,
Of the best quality.


M r. PATTEN g. SON.


- instruments made to order, and warranted.


dec 9-lm