OBJECT: To investigate the effect upon the period of a vibrating system caused by varying its mass, and to make a determination of the mass of a body by a dynamical method.
METHOD: An elastic system is so arranged that its mass can be varied. The period is observed for a number of (known) masses and a curve is plotted of the mass versus the square of the period. A body of unknown mass is then added and its mass determined from observations of the period. This dynamically determined mass is then compared with the corresponding mass obtained by weighing.
