For simultaneous listening of heart sounds by the student and instructor or two students, through a single chest piece. Consists of a Bowles chestpiece, dual head sets of plated brass binaurals with plastic earpieces, black latex extension and Y-tubing connector.

For detecting heart beats and chest sounds using double tube configuration. Can be safely used by younger students. Consists of a black bell dual stem plastic chestpiece, a head set of plated brass binaurals with plastic earpieces and black latex Y-tubing connector.

A simple and sturdy instrument for students to detect feeble sounds like heart beats. Consists of a chestpiece, latex Y-tube, plated brass binurals with plastic earpieces.

For demonstrating the formation of stationary longitudinal waves in gases or in the air and for determining the wavelength and velocity of sound in metal rods, air and other gases. Consists of a glass tube about 1000mm long and 30mm in diameter, which is closed at one end with a cork. The tube rests on wedge supports securely fastened by coil springs and mounted on a base. A 90cm long aluminum rod having a terminal disk of diameter slightly less than that of the glass tube acting as a piston in the glass tube. The aluminum rod is rigidly clamped in the middle, on a metal post. Lycopodium powder (not supplied) can be used to show nodal points.

To study and demonstrate wave motion. Closely wound spring 20mm dia. is 2m long and can be extended upto 10m.

For simple wave studies. Edge wound spring.

Four slotted iron masses of 500g each on a 500g iron hanger.

For verifying the laws of vibrating strings, frequency comparisons with vibrating bodies, and determination of the frequency of a tuning fork by tuning a string in unison with it. Consists of a hollow wooden resonance chamber measuring (l x w x h), 115 x 12 x 8cm, with two meter scales graduated in millimeters. One end of a brass and a steel wires is fixed on the edge of the resonance chamber and the other end of the wires are pegged with a tensioning key. Pulley and hook provided for the third steel wire to be tensioned by masses. Two movable bridges are also provided. Weights not included.

For experimental determination of the wave length and velocity of sound in air by locating resonance positions of an air column. Consists of a graduated neutral glass tube ( l x d), 900 x 25mm, connected by a rubber tubing and pinch cock to an aluminum water reservoir, securely mounted to a metal support. The reservoir can be raised or lowered for adjusting the length of the air column. A tuning fork is required. (not supplied).

For activating tuning forks. Made of wood with a rubber surface.