Imagini ale paginilor

EXTERNAL SENSES in greater perfection.When those avenues to the interruption of Intellectual abstraction, the Eyes and Ears, are half shut, it is reasonable to suppose, that the Thinking Faculty may be more active, and more perfect.

Those persons whose External Senses are obtuse and imperfect, are generally, close Reasoners subtle Calculators-rigid Economists, and in all respects Persons of exemplary Prudence.

[ocr errors]
[ocr errors]

The Insensibility, of people who have Bad Senses, exempts them from many diverting temptations, which assail those who SeeHear-Feel-Taste-and Smell in perfection.

That Paragon of Good Sense-Dr. S. JOHNSON, was Short-sighted, and could not see distinctly more than 4 or 5 inches from him.—

His Ears were imperfect also, when others expressed the delight they received from Music, he said, "I should be happy to have that sense given to me ;" and when a celebrated Player had finished an elaborate Concerto, which they told him was extremely difficult, he said"Sir, I wish it had been impossible."

[ocr errors]

The slovenliness of his own Dress,-- I dare


say arose from the defect in his Sight, preventing him from being sensible of the agreeable impression produced by proper attention to neatness in others.

[ocr errors]

We have irresistible evidence that his Taste was defective,—for his appreciation of a Good Dinner, was according to the Scale which Tasteless people always measure by, the Variety, the Rarity, and the Costliness of it, for he needed not Dainties to excite his Appetite; that, we are told, was sharp enough.





Is applicable to ACHROMATIC and REFLECTING TELESCOPES of all Lengths, and also to MI


[See an Engraving thereof opposite this Page.] THIS EYE-TUBE is applied to the Telescope

* Those in which the Errors arising from Colorific refraction, are corrected by the figure, position, and refractive power of the Lenses which constitute the Object-glass.

[merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][ocr errors][ocr errors][merged small][ocr errors][merged small][merged small][merged small][ocr errors]

See Dr Kitchiners Economy of the Eyes," Part 1, page 130

Published by Mefs Hurst & Robinson, London, 1824.

[ocr errors]

in the same manner as other Eye-tubes, and is adjusted to distinct Vision by the same Pinion motion.

For the Lowest Magnifying power, the Three Inner tubes must be shut up within the Outer one; when the Magnifying power is to be increased, the smallest of the sliding tubes, A, must be drawn out to either of the numbers engraved upon it; care being taken not to draw out any part of the other sliding tubes, B and C, until the whole of the First, A, is pulled out; - the Second tube, B, may then be drawn out to either of the numbers engraven thereon; and in like manner the Third tube.

The numbers engraved on the Tubes, denote the Magnifying power of the Telescope.

To change the Power for any less power than the one to which the tubes have been drawn out, the reverse of the above-described mode of proceeding must be observed; - the Largest tube must be returned first, and so on, until they have been brought back to the number required.

Each alteration of the Magnifying power will require a new adjustment of the Pinion; -as the Magnifying power is increased, the dis

« ÎnapoiContinuă »