But a magnifying power of 400 diameters, even when definition reaches the exquisite perfection of our modern achromatic lenses, hardly suffices for the mere discernment of the smallest forms of life.

Hark, hark, the bitter'st sweetest achromatic.

I also wrote a draft of my Paper on Achromatic Eye-pieces, and on May 17th, 1824, it was read at the Philosophical Society under the title of 'On the Principles and Construction of the Achromatic Eye-pieces of Telescopes, and on the Achromatism of Microscopes,' including also the effects of separating the lenses of the object-glass.

I also wrote a draft of my Paper on Achromatic Eye-pieces, and on May 17th, 1824, it was read at the Philosophical Society under the title of 'On the Principles and Construction of the Achromatic Eye-pieces of Telescopes, and on the Achromatism of Microscopes,' including also the effects of separating the lenses of the object-glass.

many things relating to trigonometry and trigonometrical tables, achromatic eye-pieces, equation to the surface bounding the rays that enter my left eye, experiments on percussion.

I find then calculations of achromatic eye-pieces for a very nice model with silk threads of various colours which I made with my own hands for my optical lectures.

On Feb. 16th Sir James South writes that Encke's Comet is seen: also that with his 12-inch achromatic, purchased at Paris, and which he was preparing to mount equatoreally, he had seen the disk of Aldebaran apparently bisected by the Moon's limb.

Achromatic object-glasses are placed on both sides of the prism, so that each pencil of light through the prism consists of parallel rays; and breadth is given to the spectrum by a cylindrical lens.

Achromatic Eye-Pieces of Telescopes, and on the Achromatism of Microscopes.

Adj. uncolored &c (color) &c 428; colorless, achromatic, aplanatic^; etiolate, etiolated; hueless^, pale, pallid; palefaced^, tallow-faced; faint, dull, cold, muddy, leaden, dun, wan, sallow, dead, dingy, ashy, ashen, ghastly, cadaverous, glassy, lackluster; discolored &c v.. light-colored, fair, blond; white &c 430. pale as death, pale as ashes, pale as a witch, pale as a ghost, pale as a corpse, white as a corpse.

A fascinating, achromatic sketch of the Geysers of Iceland, those wonderful hydraulic volcanoes, which would readily he considered objects of the greatest natural grandeur, if the hotels in the neighborhood were only a little better kept and more judiciously advertised.

The king of Bavaria followed his example by ordering a still finer instrument for the same purpose; and the king of France, with a liberality still more patriotic, has had executed in his own capital, an achromatic telescope, surpassing them all in magnitude and power.

By the aid of Tulley's achromatic microscope, and under highly magnifying powers, it has recently been discovered that the globules of the blood congeal into flat circular bodies, and arrange themselves in rows, one body being placed partly underneath another, and in like manner as a pile of similar coins, when thrown gently down, would be found to arrange themselves.

Mr. Carpenter's achromatic solar microscope has now a white circular area of nine feet in diameter, to receive the images of the objects upon, some of which are magnified to the enormous size of upwards of eight feet in length!

Among the former is a most excellent ten-feet achromatic, by the present Mr. Dolland, and a six-feet reflector, by Short, with a clock to be used with them.

One image is quite achromatic, the other shows a little colour.

With all the achromatic clearness, the unromantic colourlessness of the early morning....

The apparatus consists of a small achromatic objective placed at the extremity of the tube of a microscope, in which there is a divided screen that receives the enlarged image of the reticule fixed upon the needle.

Those made with achromatic glasses may be as much better as they are dearer, but we have not been able to satisfy ourselves of the fact.

be useful, be honorable and honored, be just, be charitable, talk pure reason, and help to disenchant the world by the light of an achromatic understanding.

The eye-piece consists of a single achromatic lens, whose focal length is about two inches.

It was 8 inches in diameter; focal length, 150 feet; not achromatic.

In March 1821, the younger Herschel, in conjunction with Sir James South, undertook a series of observations on the distances and positions of three hundred and eighty double and triple stars, by means of two splendid achromatic telescopes of five and seven focal length.