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Wheatstone Bridge Four Gap
Wheatstone Bridge Four Gap (Product Code: SLE/PHY/75) is a metre-scale slide-wire bridge used to measure unknown resistances and compare resistors in school and college physics practicals. Broad, heavily plated brass strips with four gaps sit on a polished hardwood base, and 24 SWG constantan wire is stretched along the top of a metre scale marked in mm and cm. It is made by Jain Scientific Equipments Pvt Ltd (ScienceLab), an OEM manufacturer, at its own factory in Ambala, India.
Specifications
| Parameter | Detail |
|---|---|
| Bridge strips | Broad, heavily plated brass strips with four gaps |
| Resistance wire | 24 SWG constantan, stretched along the top of the scale |
| Scale | Metre scale marked in mm and cm |
| Terminals | Terminals with 4 mm sockets |
| Base | Polished hardwood |
| Included | Jockey |
| Dimensions | 1130 × 80 × 50 mm |
| Product code | SLE/PHY/75 |
| Manufacturer | Jain Scientific Equipments Pvt Ltd (ScienceLab) — OEM |
| Country of origin | India (made in Ambala, Haryana) |
What Is the Four-Gap Wheatstone Bridge Used For?
With a known resistance in one gap and the unknown in another, a galvanometer connected between the bridge and the jockey shows zero deflection at the balance point, and the two lengths of wire on either side give the ratio of the resistances. The extra gaps allow more elaborate set-ups, such as the Carey Foster arrangement for comparing two nearly equal resistances, in which the resistors are interchanged to cancel end errors.
Typical practicals include finding the resistance and specific resistance of a wire and checking the laws of resistors in series and parallel, which makes this a practical Wheatstone bridge experiment kit once a cell, key, galvanometer and resistance box are added. Tighten the terminals firmly, tap the jockey rather than sliding it along the wire, and repeat each balance with the resistors swapped for a more reliable mean.
OEM Manufacturer
Jain Scientific Equipments Private Limited, which trades as ScienceLab, is the OEM of this four-gap bridge and produces it at its own licensed factory at Saha, Ambala, Haryana, India. ScienceLab is the trading name of Jain Scientific Equipments Private Limited (CIN U29309HR2020PTC087597), and the factory at 449, HSIIDC Industrial Area, Saha operates under Factory Licence AMB-ONLINE-CHD-J-414. Laboratories and dealers deal with the manufacturer itself for quotations, repeat orders and spare jockeys — details are on the company profile.
Related Physics Lab Equipment
Items needed to complete a bridge experiment:
- Jockey with Insulated Handle (Single) — a spare jockey for the bridge wire
- Moving Coil Galvanometer — the balance detector across the bridge
- Resistance Box — supplies the known resistance in one gap
- Constantan Wire — sample wire for specific-resistance experiments
- Meter Bridge — an alternative bridge for resistance practicals
Browse the rest of Physics Lab Equipment.
Frequently Asked Questions
What is the Wheatstone Bridge Four Gap used to measure?
The Wheatstone Bridge Four Gap is used to measure an unknown resistance by balancing it against a known one, and to find the specific resistance of a wire. Its four gaps also allow comparison of two nearly equal resistances by the Carey Foster method.
What are the dimensions of the Wheatstone Bridge Four Gap?
The Wheatstone Bridge Four Gap measures 1130 × 80 × 50 mm. Its metre scale, marked in millimetres and centimetres, runs under the 24 SWG constantan wire, so allow a bench space of a little over a metre plus room for the other circuit items.
What comes with the Wheatstone Bridge Four Gap?
The Wheatstone Bridge Four Gap comes with a jockey, fitted with its plated brass strips, constantan wire, metre scale and 4 mm socket terminals on the hardwood base. The galvanometer, resistance box, cell, key and leads are ordered separately.
Who manufactures the Wheatstone Bridge Four Gap?
The Wheatstone Bridge Four Gap is manufactured by Jain Scientific Equipments Pvt Ltd (ScienceLab) as the OEM at its licensed factory in Saha, Ambala, Haryana, India, and is sold factory-direct to schools, colleges, dealers and importers in India and international markets.
How should the bridge wire be looked after?
On the Wheatstone Bridge Four Gap, tap the jockey onto the constantan wire and lift it before moving, because sliding it while pressed scratches the wire. Keep the brass strips and terminals clean and dry, and store the bridge flat so the wire stays taut.
Can we order Wheatstone bridges for a whole lab?
Yes, the Wheatstone Bridge Four Gap can be ordered in class quantities. Send the number of bridges, any matching galvanometers or resistance boxes, and your delivery location through the enquiry cart or contact page, and the manufacturer will quote the full set.
Request a Quote
Quotations for the Wheatstone Bridge Four Gap come straight from the manufacturer. Write to us through the contact page or add it to the enquiry cart.
Last updated: 24 September 2026
