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Show The Navlpendulum. One of tho problems which nnvnl architects hnvo to confront Is tho rolling roll-ing of n ship on the waves, nnd tho "navlpendulum" Is nn Invention for dealing with It experimentally. Tho apparatus consists of two parts: A plato to which n motion corresponding cor-responding to that of n portion of tho surface of n wave Is Impnrted, and n pendulum of n pecullnr shapo which rolls upon tho moving plate In the manner man-ner of n vessel supported by wnter. Tho sntno pendulum can bo made to represent different vessels of given size nnd shnpo by adding or rcrimvlnfi nrtlflclnl rcslstnnco to tho oscillatory motion. This Instrument has been employed to study tho rolling of tho Itnllnn battleships bat-tleships as well ns thoso of othei countries. |