The Civil engineer and architect's journal, scientific and railway gazette (1839)
London : [William Laxton] · leaf 297
Let a, a, represent the apparent of the objects A, A, when viewedfrom A and A ; then is the angle A A a, the refraction of A, and theangle a Aa, the amount of refraction of A; half the sum of thesetwo angles will be the horizontal or terrestrial refraction, supposingit equal at each station. Now an…
Architecture · Civil engineering · Science
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