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. 1834 Excerpt: ...parallax, the sum will be the proportional logarithm of the diminution of parallax; the difference between which, and the parallax in altitude, is the parallactic correction, which is to be subtracted from the observed distance, if the parallax in altitude is the greater, but if otherwise, to be added. 4. To the ...
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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. 1834 Excerpt: ...parallax, the sum will be the proportional logarithm of the diminution of parallax; the difference between which, and the parallax in altitude, is the parallactic correction, which is to be subtracted from the observed distance, if the parallax in altitude is the greater, but if otherwise, to be added. 4. To the logarithmic sine of the moon's altitude add the proportional logarithm of the parallactic correction, and subtract the sum from the proportional logarithm of the horizontal parallax; the difference will be the tangent of an angle, which is the refractional distance for the moon. Consider as zenith distances both this angle and the difference between it and the apparent distance, and find the corresponding refractions in a table of refraction. These will be the first and second refractional corrections; the first of which is to be applied to the apparent distance, with a contrary sign to that of the parallactic correction, and the second to be added when the refractional distance for the moon is less than the observed distance; otherwise the second refractional correction must be subtracted. 5. Add together the proportional logarithm of the diminution of parallax, that of the sum of the parallactic correction and the parallax in altitude, the logarithmic tangent of the apparent distance and the constant logarithm 1.5870, the sum will be the proportional logarithm of the correction for obliquity, which is always additive. Refractional distance for 5 0 88' Apparent distance 4 0 For zenith distance, Apparent distance, Parallactic correction, 0st Refractional correction, 0d Refractional correction, Correction for obliquity, True distance, . Difference 00 48 0 88' tab. refraction, = 00 0 B, .., 0 4g =000 0 tten"actlonal corrections 000 P. log., 0-880 4...
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Add this copy of A Treatise on Marine Surveying to cart. $375.00, fair condition, Sold by Sequitur Books rated 5.0 out of 5 stars, ships from Boonsboro, MD, UNITED STATES, published 1834 by London: Longman, Rees, & Co.
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Seller's Description:
Fair. xvi, 164, [79] p. extensive section of tables. 7 folding plates; 22 cm. Hardcover with cloth spine. Internally very good. Spine is partially torn and fraying, gutter cracked. Mild water damage to cover and front end pages (text and plates unharmed). Ownership signature to attached front end page. Text/tables/plates clean/ clear and in very good condition. Contents:
