Appleton's dictionary of machines, mechanics, engine-work, and engineering : illustrated with four thousand engravings on wood ; in two volumes (1873)
D. Appleton and Company · New York : D. Appleton and Co. · leaf 624
action, however, is too considerable to beneglected in estimating the range of a light, or in computing the height of a tower which is required tcgive to any liglit a given range; and we must, therefore, in accordance with the influence of this element,on the one hand increase the range due to any… … Referring to the accompanying figure, 3314, in which S d L is a segment of the oceans surface, 0 ttiecentre of the earth, L L a light-house, and S the position of the mariners eye, we obtain the value ofL L ^ H, the height of the tower in feet by the formula, IP W — — (1.) 3 ^ ir. which I = the…
Mechanical engineering · Mechanics · Engineering
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