Page:Popular Science Monthly Volume 34.djvu/319

Rh This force is resolvable into two others, the horizontal S H, and the vertical S Z; and the former is further divisible into S B, parallel to the midship line, and B H, transverse to it.

The magnetic power of the bar is thus resolved parallel to the



three co-ordinate axes. Almost all the structural iron of the ship—beams, knees, engines, boilers, etc.—is symmetrically arranged with reference to the vertical plane through the keel; so that for a piece T, on the starboard side, we should generally find another similarly disposed on the port side.