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Books Books 1 - 10 of 17 on Huyghens for telescopes, with no other view than that of diminishing the spherical....  
" Huyghens for telescopes, with no other view than that of diminishing the spherical aberration by producing the refractions at two glasses instead of one, and of increasing the field of view. It consists of two planoconvex lenses, with their plane sides... "
A Practical Treatise on the Use of the Microscope: Including the Different ... - Page 192
by John Quekett - 1855 - 556 pages
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Manual of Botany

John Hutton Balfour - Science - 1851 - 642 pages
...is called Hnyghen'?, and consists of two plano-convex lenses with their plane sides toward the eyt, and placed at a distance apart equal to half the sum of their focal lengths, with a diaphragm placed midway between the lenses. In this eye-piece, the leanext the eye is called the eye-glass,...
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The microscope: its history, construction, and applications ...

Jabez Hogg - Microscopes - 1854 - 440 pages
...lenses, with their plane sides towards the eye, and placed at a distance apart equal to half the sum at their focal lengths, with a stop or diaphragm placed...of the value of his eye-piece ; it was reserved for Boscovicb. to point out that he had, by this important arrangement, accidentally corrected a great...
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The Microscopist's Companion; a Popular Manual of Practical Microscopy: To ...

John King - Microscope and microscopy - 1859 - 308 pages
...increasing the field of view. It consists of two plano-convex lenses, with their plane sides toward the eye, and placed at a distance apart equal to half...lengths, with a stop or diaphragm placed midway between these two lenses. Hnyghens was not aware of the value of his eye-piece ; it was reserved for Boscovich...
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The microscope: its history, construction, and application, being a familiar ...

Jabez Hogg - Science - 1861 - 621 pages
...Huyghens for telescopes, with no other view than that of diminishing the spherical aberration by p/oducing the refractions at two glasses instead of one, and...diaphragm placed midway between the lenses. Huyghens TO not aware of the value of his eye-piece ; it was reserved for Boscovich to point out that he had,...
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A manual of botany

John Hutton Balfour - 1863
...also, must be so formed as to be free from error. That used is called Huyghens', and consists of two pL lenses with their plane sides towards the eye, and...equal to half the sum of their focal lengths, with a diaphragm inserted midway between the lenses. In this eye-piece, the lens next the eye u called the...
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The Chicago Medical Journal and Examiner, Volume 35

Medicine - 1877
...lenses, with their plane sides next the eye, whose focal lengths are as 3 to 1, and which are placed a distance apart equal to half the sum of their focal lengths. This is, to be sure, an old formula, but is not used so far as we are aware, by any modern maker. The...
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The Chicago Medical Journal and Examiner, Volume 35

Medicine - 1877
...lenses, with their plane sides next the eye, whose focal lengths are as 3 to 1, and which are placed a distance apart equal to half the sum of their focal lengths. This is, to be sure, an old formula, but is not used so far as we are aware, by any modern maker. The...
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Journal of the Royal Microscopical Society

Microscopy - 1885
...produce a fair combination." Two plano-convex lenses with foci 2 : 1 placed with planes to object and at a distance apart equal to half the sum of their focal lengths — the shorter focus lens being a thick one. With perfectly central light the definition of thin objects...
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Journal of the Royal Microscopical Society

Frank Crisp - 1885
...produce a fair combination." Two plano-convex lenses with foci H :1 placed with planes to object and at a distance apart equal to half the sum of their focal lengths —the shorter focus lens being a thick one. With perfectly central light the definition of thin objects...
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The Elements of physics, Volume 3

Edward Leamington Nichols - 1903
...1680. It consists of two lenses of similar glass, the respective focal lengths are as 3:1, and they are placed at a distance apart equal to half the sum of their respective focal lengths. This doublet is partially eye achromatic,* and it has a end very wide flat...
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