Fig16-2, page 46 referenced in Daily Question for Dec. 30 Comments

Please keep in mind this applies to small angles of transverse inclination say no more than 5 to 8 degrees. As B moved transversely it travels in the path of an arc for a wall sided vessel. The center of the arc is located at M where B is acting upward through M, the Metacenter. The radius of this arc is BM, the Metacentric Radius. My favorite illustration is Fig. 16-2, on page 46, of the 4th Edition of "Stability and Trim for the Ship's Officer".