A combination tuning fork set that allows two demonstrations. Without the weights, one fork responds to the vibrations of the other, illustrating sympathetic vibration at distances. With the weights, one fork can be tuned 1 or more cps different, and both, when struck will produce beats of startling clarity. These are extra heavy (32mm wide) chrome plated steel forks mounted in hardwood resonators. Mallet included.

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

This high-quality, aluminium tuning fork delivers fine tones in 7 frequencies. Features adjustable weights for obtaining the following tones: C 128, D 144, E 160, F 170.7, G 192, A 213.3 and B 240. Scale letters are all clearly defined on stem. Overall length is 200mm.

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

For demonstrating the relationship between sound and vibrations, the energy transfer between resonating systems and as a source of standard frequencies.

 Milled from non-rusting non-magnetic aluminium bar stock. Plain shank form. Stamped with the musical scale note sounded by the fork and the frequency in Hz at the base of the tine of each fork. Lengths vary.

Frequency, Hz	Cat. No.
128	3610-02
256	3610-04
288	3610-06
320	3610-08
341.3	3610-10
384	3610-12
426.6	3610-14
480	3610-16
512	3610-18
271	3610-19
304	3610-21
362	3610-23
406	3610-24
456	3610-25

Includes tuning forks of frequencies from 256 to 512Hz listed above.



Wooden Case            :  3610-00

Plastic Case              :  3610-01

Includes tuning forks of frequencies from 256 to 512 Hz listed above. In a fitted wooden case.

Individually constructed of forged steel. Plain shank form. Stamped with the musical scale note sounded by the fork and the frequency in Hz at the base of the tine of each fork. Lengths vary. Chrome plated.

Frequency, Hz	Cat. No.
128	3620-02
256	3620-04
288	3620-06
320	3620-08
341.3	3620-10
384	3620-12
426.6	3620-14
480	3620-16
512	3620-18

Consists of three drilled , aluminium tuning forks, tethering cord anda rubber striking mallet. Effectively demonstrates the change in pitch as the vibrating tuning forks are whirled toward and away from user.

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 (I x d), 900 x 25mm, connected by a rubber tubing and pinch cock to an aluminium 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).

A simple wooden organ pipe with mouth piece whistle and a sliding piston to vary length. Demonstrates the change in frequency with air column.

Electric bell operating on 3-6 volts AC/DC, suspended in bell jar 200x103 mm, height x diameter. Complete with wire and terminals for connection.

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 (I 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.

Mounted on a solid MDF board 1090x100mm with rubber feet. It has 2 steel wires attached to two 0-50N spring scales and corresponding wrest pins at the other end. Also supplied along are two small and one large bridge. Two set of spare steel wires are also included.

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

For simple wave studies.
Edge wound spring.

Closed Length	Diameter	Extended	length	Cat No.
150mm	75mm	Approx	20m	3638-01
60mm	75mm	Approx	8m	3638-02

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

For demonstrating formation of stationary longitudinal waves in air or gases 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 aluminium rod having a terminal disk of diameter slightly less than that of the glass tube acting as a piston in the glass tube. The aluminium rod is rigidly clamped in the middle, on a metal post. Lycopodium powder (not supplied) can be used to show nodal points.

For demonstrating longitudinal and transverse motion. Consisting of a number of centric aluminium discs supporting series of metal rods, joined to a handle. On revolving the handle simulation of waves can be obtained on rods running in metal guide.

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.