 | Thomas Keith - 1810 - 478 pages
...these equals take the /»p£,then /cf-/*sA— ZEP£=/»ZSP + /£FS the sum of the two refractions; that is, subtract the depression from the sum of the contained arc and elevation, and half the remainder is the mean refraction. Perhaps it may be necessary to remark, that... | |
 | Thomas Keith - 1826 - 504 pages
...the L BP¿, then ¿_ e -f- L esA — L BPÜ>= Z. msp + L OPS the sum of the two refractions ; that is, subtract the depression from the sum of the contained arc and elevation, and half the remainder is the mean refraction. Perhaps it may be accessary to remark, that... | |
 | Thomas Keith - 1839 - 498 pages
...equals take the L BP&, then the sum of the two refractions L msp + L SPS= L c + L esA — L BP£ ; that is, subtract the depression from the sum of the contained arc and elevation, and half the remainder is the mean refraction. Perhaps it may be necessary to remark, that... | |
 | John Gregory - 1843 - 350 pages
...refraction. If one of the points, B, be elevated to the point g, instead of being depressed, then the rule is, subtract the depression from the sum of the contained...and half the remainder is the mean refraction. The angles should be taken simultaneously by means of signals, or by watches previously regulated for the... | |
 | Edward Charles Frome - 1850 - 294 pages
...equal to 365,110 feet, or 69-15 miles; and one second = 101-42 feet. the sum of the two angles, e AB and EBA, will be greater than EAB + EBA (the angle...the depression from the sum of the contained arc and tTtc elevation, and half the remainder is the mean refraction *. The refraction thus found must be... | |
 | Edward Charles Frome - 1862 - 336 pages
...elevation being g AD, then the sum of the two angles, e AB and e BA, will be greater than E AB + EB A (the angle C, or the contained arc) by the angle of elevation, e AD ; but if from c AB + e BA, we take the depression OB a, there will remain e AB + a BA, the sum of the two refractions... | |
 | Edward Charles Frome - 1873 - 384 pages
...elevation being g AD, then the sum of the two angles, e AB and e BA, will be greater than EA B+EBA (the angle C, or the contained arc) by the angle of elevation, e AD; but if from e A BJe BA, we take the depression OB a, there will remain e A B-)-a BA, the sum of the two re-. fractions;... | |
 | Anthony Nesbit - 1859 - 482 pages
...these equals take the Z BPi, then the sum of the two refractions /_m$P+ /_bPS= ZC+ZeSA— ZBP6; that is, subtract the depression from the sum of the contained arc and elevation, and half the remainder is the mean refraction. Perhaps it may be necessary to remark, that... | |
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BA, the sum of the two refractions ; the rule for the mean refraction then in this case is, subtract the depression from the sum of the contained arc and the elevation, and half the remainder is the mean refraction* The refraction... 