 | Edward Charles Frome - 1862 - 336 pages
...the angles b AB, a BA, the sum of the two refractions ; hence, supposing half that sum to be the true refraction, we have the following rule when the objects...are reciprocally depressed. Subtract the sum of the ttco depressions from the contained arc, and half the remainder is the mean refraction : — * Carr-s... | |
 | Edward Charles Frome - 1873 - 384 pages
...the angles b AB, a BA, the sum of the two refractions; hence, supposing half that sum to be the true refraction, we have the following rule when the objects...arc, and half the remainder is the mean refraction. * Carr's "Synopsis of Practical Philosophy,"articles 'Levelling'and 'Refraction.' t "Trigonometrical... | |
 | Edward Charles Frome - 1873 - 446 pages
...the angles & AB, a BA, the sum of the two refractions ; hence, supposing half that sum to be the true refraction, we have the following rule when the objects...of the two depressions from the contained arc, and ludf tlie remainder is the mean refraction. * Carr's "Synopsis of Practical Philosophy, "articles 'Levelling'... | |
 | Canadian Society of Civil Engineers - 1890 - 832 pages
...angles b AB and a BA the sum of the two refractions ; hence supposing half that sum to be the true refraction, we have the following rule when the objects...depressed : Subtract the sum of the two depressions rom the contained arc, and half the remainder it the mean refraction. the contained arc and the elivation... | |
 | Anthony Nesbit - 1859 - 482 pages
...ZBPS)-(Z ASa + ZBP6)=(Z OSP + L OPS) - ( L ASa + L BP6)= LC - ( L ASa + L BP4). Hence the following RULE. Subtract the sum of the two depressions from the contained arc, and half the remainder is'the mean refraction. If one of the objects (A), instead of being depressed, be elevated, suppose... | |
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BA, the sum of the two refractions ; hence, supposing half that sum to be the true refraction, we have the following rule when the objects are reciprocally depressed. Subtract the sum of the two depressions from the contained arc, and half the remainder... 
