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jockey
jockey (Product Code: SCL-374/086) is a pencil-type sliding contact used to locate the balance point along the wire in Wheatstone bridge and potentiometer experiments in physics laboratories. Students hold it by its insulated handle and touch its plated brass contact to the wire, while a plated brass terminal with a 4 mm socket links it to the galvanometer. The jockey is made by Jain Scientific Equipments Pvt Ltd (ScienceLab), an OEM manufacturer, at its own factory in Ambala, India.
Specifications
| Parameter | Detail |
|---|---|
| Type | Pencil jockey (sliding contact) |
| Handle | Insulated |
| Contact | Plated brass |
| Terminal | Plated brass, with 4 mm socket |
| Used in | Wheatstone bridge and potentiometer experiments |
| Product code | SCL-374/086 |
| Manufacturer | Jain Scientific Equipments Pvt Ltd (ScienceLab) — OEM |
| Country of origin | India (made in Ambala, Haryana) |
What Is a Pencil Jockey Used For?
On a meter bridge or Wheatstone bridge, the jockey is connected through the galvanometer and tapped at points along the bridge wire until the galvanometer shows no deflection; that null point gives the balancing length used to calculate an unknown resistance. On a potentiometer, the same technique finds the balancing lengths for comparing the EMFs of two cells or measuring a cell’s internal resistance.
This makes the jockey an essential accessory for meter bridge lab work in India and for every potentiometer practical. Press it gently and briefly, lift it, then move to the next point — dragging a pressed jockey scrapes the wire and changes its resistance per unit length. Hold it only by the insulated handle and keep the brass tip clean for a reliable contact.
What to Specify When Ordering
- The number of jockeys needed, usually one per bridge or potentiometer.
- That your galvanometer leads use 4 mm plugs to fit the socket terminal.
- Whether a meter bridge, potentiometer or galvanometer should be quoted with it.
OEM Manufacturer
The jockey is produced by Jain Scientific Equipments Private Limited, trading as ScienceLab, at its own licensed factory in Saha, Ambala, Haryana, where the company is the original equipment manufacturer (OEM) of its bridge and potentiometer accessories. Because it comes straight from the maker, schools, colleges, dealers and importers can add it to bridge orders and ask us directly about replacement pieces or repeat quantities. Learn more on the company profile.
Related Physics Lab Equipment
Apparatus the jockey is used with during balance-point experiments:
- Meter Bridge — the bridge wire on which the jockey finds the null point.
- Wheatstone Bridge Apparatus — for resistance measurement using the same balance method.
- Potentiometer, 10 wire — long-wire apparatus where the jockey locates balancing lengths.
- Moving Coil Galvanometer — shows the zero deflection at the balance point.
- Banana Plug Connectors Leads — 4 mm leads to join the jockey to the galvanometer.
Find more electricity apparatus in the Physics Lab category.
Frequently Asked Questions
What is the jockey used for?
The jockey is a pencil-type sliding contact used to find the balance, or null, point on the wire of a Wheatstone bridge or potentiometer. It links the wire to the galvanometer, and the point where the galvanometer shows no deflection gives the balancing length.
How does the jockey connect to the circuit?
The jockey connects through a plated brass terminal fitted with a 4 mm socket, so a lead with a 4 mm plug can join it to the galvanometer. The plated brass contact at its tip then touches the bridge or potentiometer wire wherever a reading is needed.
Why does the jockey have an insulated handle?
The insulated handle lets students hold the jockey without their hand touching the conducting parts, which keeps readings steady and avoids stray contact. It also gives a comfortable pencil-style grip for placing the contact precisely along the wire.
How should the jockey be used to protect the bridge wire?
Press the jockey gently and briefly onto the wire, lift it, and move to the next point instead of dragging it while pressed. Scraping the contact along the wire wears it unevenly and changes its resistance per unit length, which spoils later readings.
Who manufactures the jockey?
The jockey is manufactured by Jain Scientific Equipments Pvt Ltd (ScienceLab) as the OEM at its own factory in Saha, Ambala, Haryana, India. It is supplied factory-direct to schools, colleges, dealers and importers in India and international markets.
Can the jockey be ordered as a spare for existing bridges?
Yes, the jockey can be quoted on its own as a spare for existing meter bridge, Wheatstone bridge or potentiometer setups, or together with new apparatus. Tell us the quantity and confirm that your leads use 4 mm plugs when you request a quotation.
Request a Quote
Ask for a jockey quotation through the contact page or place it in the enquiry cart. You will receive the quotation directly from the manufacturer.
Last updated: 24 September 2026
