Simple type model, it comprises a wooden board 700 x 90 mm (L x W) on four feet, fitted with two steel wires about 0.3mm x 1m (dia x length). At one end of base there are two 50 N spring balances with hooks and at the other end are two wrest pins.
Supplied complete with three bridges, one large, to span both wires and two small bridges for individual wires, two steel wires 0.3 mm dia. x 1 meter long.
Comprises a hollow wooden resonance box 120 x 12.5 x 10 cms (L x W x H.) Two wooden rules 1 mtr. long subdivided in mms, between fixed bridges over which wires are stretched. A spring balance 100 x 5 N is fitted on one wire. Tension exerted can thus be measured and also adjustable finely by a wing nut resting against a plate at the end of the apparatus, second wire passes over a pulley and can be loaded as desired, a third wire is given for comparison and its tension adjustable by a wrest pin.
The wires are made of rustless steel having uniform density. Distance between fixed bridges is kept 720 mm. Supplied complete with three movable bridges, a set of four wires 1.5 mtr. each. Supplied without weights.
Spares and accessories
This apparatus is an improvement over the conventional apparatus to show the effects of vibrations in a stretched cord and examine the relationship between frequency, tension and density. A thin steel rod is clamped near one end through two 4 mm socket terminals. This rod passes through the centre of a small solenoid and between the poles of a magnet. Adjustable contact points fitted through a second pair of 4 mm socket terminals make alternating connection with an adjustable contact on the rod. The rod has a small hole at one end for the attachment of thread which passes over a pulley mounted on a bench clamp and supports a scale pan, 75 mm diameter. Supplied complete with pulley with clamp and scale pan.
Accessory : 2V A.C. power supply P-7395/1
Glass Tube approx. 84cm long and 2.5cm dia mounted on retort stand with clamp and boss, with 500ml glass bulb supported on iron ring, connecting rubber tubing and spring clip.
Spares Glass Tube for P-7475 P-7448/1
Reservoir Bulb for P-7475 P-7448/2
