. Natural philosophy. including statics, hydrostatics, pneumatics, dynamics, hydrodynamics, the general theory of undulations, the science of sound, the mechanical theory of music, etc. : designed for the use of normal and grammar schools, and the higher classes in common schools . n ac-cording to the form of the plate, its size, its elasticity, th^rapidity of the vibrations, the mode in which they areproduced, the point by which the plate is fixed, &c. Theirposition may be determined by scattering sand or coloredpowder on the plate and vibrating by means of violin-bow,—the sand is thrown off
. Natural philosophy. including statics, hydrostatics, pneumatics, dynamics, hydrodynamics, the general theory of undulations, the science of sound, the mechanical theory of music, etc. : designed for the use of normal and grammar schools, and the higher classes in common schools . n ac-cording to the form of the plate, its size, its elasticity, th^rapidity of the vibrations, the mode in which they areproduced, the point by which the plate is fixed, &c. Theirposition may be determined by scattering sand or coloredpowder on the plate and vibrating by means of violin-bow,—the sand is thrown off the internodes and arrano:esitself along the nodal lines forming the so called nodalfigures or acoustic figures. 360. Nodal figures have a great variety in their formbut are generally very symmetrical. Several hundredhave been figured. The accompanying illustration repre-sents a few of those obtained on square and circularplates. The plates are supposed to be fastened in a vice at the pointrr, and the violin-bow drawn over the edge at the point 6. Infigure III the finor3r is placed on the edge of the plate at a point45<* from b, in IV at a point G0° or 30° or 90° from b. In Vthe finger is placed at tc. Arts. 360-25-23 UNDULATIONS IN LIQUIDS. Fi-. 3- a m ffii. a:. W7\ AC - h 1 44X 361. The vibrations of elastic plates are performed ac-cardino; to the following laws:— . I. Tlie nnmher of vibrations is independent of the breadth of the The number of viljTcUions ii proportional to the thick-ness of The thickness being the same, the number of vibra-tions varies inversely as the square of its length. Note.—The plate is supposed to be, in each case, composed of the samesubstance. UNDULATIONS IN Undulations in a liquid are caused by the vibra-tory movement of its molecules in such a manner that eachparticle describes a vertical circle, about the spot in whichit may chance to be, revolving in the direction of the ad-vancing wave. This rot
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Keywords: ., bookcentury1800, bookdecade1860, booksubjectphysics, bookyear1867
