This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1859 Excerpt: ...pencil from a point P after refraction through the object-glass converges very nearly to a point 9 in PC produced (Art. 197), --Cp being equal to the focal ength of the object-glass, and thus pa an inverted image of PQ is formed. This image--from the adjustment of the instrument--is at the principal focus of the eye ...
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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1859 Excerpt: ...pencil from a point P after refraction through the object-glass converges very nearly to a point 9 in PC produced (Art. 197), --Cp being equal to the focal ength of the object-glass, and thus pa an inverted image of PQ is formed. This image--from the adjustment of the instrument--is at the principal focus of the eye-glass; and therefore a pencil diverging from a point p of the image consists after excentrical refraction through the eye-glass of rays parallel to pc, (Art. 197), and suitable for giving distinct vision of the image of p formed by the eye-glass, to an eye applied to the eye-glass. Thus an inverted image of PQ is seen through the Telescope. 205. Field of View. If P1 be a point of the object such that the ray PA of the pencil from it is refracted in the line Ab, which joins opposite parts of the object-glass and eye-glass, then every ray of this pencil--and also every ray of a pencil from any point nearer to Q than Pt is, --falls upon the eye-glass and is refracted to the eye. Again if P2 be a point in the object such that the ray PJi of the pencil from it is refracted in the line Bb, which joins corresponding parts of the objectglass and eye-glass, then of this pencil this ray alone falls upon the eye-glass, and is refracted to the eye. Of a pencil from a point between P1 and Pa a portion reaches the eye;--which portion is less and less as the point is more and more distant from Q, and no ray of a pencil from a point more distant than P2 from Q is refracted by the eye-glass. Hence on looking through the telescope, points whose angular distance from Q exceeds PtCQ are more and more faint as this distance is greater, --and points whose angular distance from Q exceeds P2CQ are invisible. This gradual fading away of objects at a distance from the centr
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Add this copy of A Treatise on Optics to cart. $30.23, good condition, Sold by Anybook rated 5.0 out of 5 stars, ships from Lincoln, UNITED KINGDOM, published 1870 by Macmillan and Co.
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Seller's Description:
This is an ex-library book and may have the usual library/used-book markings inside. This book has hardback covers. In good all round condition. No dust jacket. Octavo. Green cloth bound. Gilt writing on spine. Top of spine is scuffed but still intact. Pages are age toned. Pencil on last page. End paper in back of book is torn at the top. Please note the Image in this listing is a stock photo and may not match the covers of the actual item, 450grams, ISBN:
Add this copy of A Treatise on Optics to cart. $66.74, good condition, Sold by Bonita rated 4.0 out of 5 stars, ships from Newport Coast, CA, UNITED STATES, published 2016 by Palala Press.
Add this copy of Treatise on Optics to cart. $68.07, good condition, Sold by Bonita rated 4.0 out of 5 stars, ships from Newport Coast, CA, UNITED STATES, published 2016 by Wentworth Press.
Add this copy of A Treatise on Optics to cart. $70.74, good condition, Sold by Bonita rated 4.0 out of 5 stars, ships from Newport Coast, CA, UNITED STATES, published 2019 by Wentworth Press.
Add this copy of A Treatise on Optics to cart. $52.00, good condition, Sold by Old Book Shop of Bordentown rated 3.0 out of 5 stars, ships from Bordentown, NJ, UNITED STATES, published 1866 by Macmillan.
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Seller's Description:
Good. Hardcover in green cloth letetred in gilt. The second ediiton, revised. 328 pp. plus publisher's catalog at rear dated April, 1868. Illustrated throughout with diagrams. Very good, mathematical notations, some in ink and some in pencil, on front and rear endpapers and similar notations in a few places in the text. Some splittingn to the front gutter and bumping to the tips, wear at the spine extremities.
