Publisher's Synopsis
Excerpt from Rudimentary Treatise on the History, Construction, and Illumination of Lighthouses
General considerations, 25 - Height of tower, and accommodation re quired therein, 26 - Force of the waves, 27 - Stevenson's marine dynamometer, 27 Source of stability in a lighthouse-tower, weight or strength, 28 - Quantity of matter required to produce stability, 31 - Form of the tower, 34 - Position of its centre of gravity, 35 - The cone and the form derived from piling succes sive conical layers, 36 - Ancient Egyptian symbol of stability, 39 - Application of the preceding views to practice, particularly at Skerryvore, 40 - Outline of solid produced by various curves, 43 Hyperbola preferred, 45 - E?'ect of vertical pressure in uniting the materials, 47 - Arrangement of external courses in the form Of an inverted arch, 50 - Spiral arrangement of courses opposed to horizontal dislocation, 51-union of materials by means of joggles, dovetails, &c., 51 - Lighthouses on land, 54 - Iron light houses, 54 - Screw-pile, 59.
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