SCIENTIFIC EXHIBITION.
{"newspaper_name": "The Wilmingtonian.", "edition": "01", "page": "p1", "byline": ""}
{"character_count": 1129, "word_count": 201, "ccnet_language_score": [0.9160000085830688], "ccnet_perplexity": [2018.5], "fasttext_language": ["en"]}
An exhibition announced to take place
in Salem (Mass.) is described as "repre.
,entation of the retina of the hnman eye,
and the inverted image painted upon it al
distinctly as the images in mirror. This
instrument besides showing in reality thar
we do see every thing upside down, dc
monStrates that the image OF perfect eye
lis formed when the focus falls upon the
retina and that the images Of eyes of =
too great convexity, or not sufficiently
convex, are formed the one before the re-
tina and the other behind it. The inven-
tor of it is, MIR. David b. Slack. The
principles Of the instrument will be shewn
in four globes Of glass, one Of which is :
or 8 inches in diameter. The instrument
Exhibits five different principles. The ca
merG obScara; the reflected camera OBJ
scura; the microscope; the reflected mi
croscope and the effect of the different
convexities Oflenses, all in one little globe.
The images are uncommonly brilliant, and
ITS magnifying power so great as to give
one the sensation of wonder; yet so SIM
pie is the construction of the instrument,
that a child may make one, and under
stand its principles"