To withstand storms, light-towers that are built on rocks out at sea are constructed with consideration to form, weight, and rigidity[1]. The form generally adopted is that of horizontal conic sections so that the vertical outline of the tower forms a curve convex to its axis[1]. With this form, a low center of gravity is obtained, and great strength is imparted to the lower part of the tower[1].
The force of inertia produced by the weight of the material of construction is a most important element[1]. To ensure rigidity and to prevent the loosening of any of the stone blocks, the stones are joined to each other by dovetailed joints and by metal bolts at the sides and at the top and bottom so that no single stone can be moved without disturbing all its neighbors[1]. The lowest course is fixed onto the rock itself in a similar manner[1].
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