Pencil Jockey
Product Code : EL-EAE-10291
Quick answer: A pencil jockey is the hand-held contact used to find the balance or null point on the wire of a meter bridge or potentiometer. This one has a Bakelite moulded handle, a brass-plated contact with a locating notch and a heavy lock-type brass-plated terminal for the lead. Lab Exports manufactures it in Delhi for schools, colleges and universities.
Specifications
| Part | Specification |
|---|---|
| Handle | Bakelite, moulded |
| Contact | Brass plated, with locating notch |
| Terminal | Heavy lock type, brass plated, for connection with a lead |
| For use with | Wheatstone (meter) bridges and all types of potentiometers |
How it is used
In bridge and potentiometer experiments the galvanometer lead is connected to the jockey, and the jockey is touched onto the bare resistance wire to test each point. The student presses it down briefly, watches the galvanometer, lifts it and tries again a little further along, closing in on the point of zero deflection.
The jockey should be pressed and lifted rather than dragged along the wire. Sliding it while pressed scrapes the wire, changes its cross-section and upsets the uniform resistance per centimetre on which the balancing-length calculation depends. The locating notch helps keep the contact on the wire at the chosen scale mark.
Key features
- Bakelite moulded handle giving an insulated, comfortable grip.
- Brass-plated contact for a clean electrical touch on the bridge or potentiometer wire.
- Locating notch that seats the contact on the wire at the reading point.
- Heavy lock-type brass-plated terminal that holds the galvanometer lead securely.
- Suits meter bridges, Wheatstone bridges and all types of slide-wire potentiometers.
Documentation and supply
Most Lab Exports products carry a one-year manufacturer warranty.
Lab Exports manufactures the pencil jockey at its works in Laxmi Nagar, Delhi, and supplies it to schools, colleges and universities in India and 60+ countries, handling the export documents for each shipment. More about the company is on the About Lab Exports page.
Related Electrical and Electronics products
- Potentiometer with Jockey Pencil (EL-EAE-10290)
- Circuit Board Junior (EL-EAE-10292)
- Meter Bridge or Wheatstone Bridge with Pencil Jockey (EL-EAE-10289)
- Circuit Board Senior (EL-EAE-10293)
- Rheostat Nichrome Wire Groove Type (EL-EAE-10288)
- Hoffman Voltameter (EL-EAE-10294)
The full range is in the Electrical and Electronics section of the Physics Lab range.
Frequently asked questions
Which instruments is the pencil jockey used with?
It is used with meter bridges (slide-wire Wheatstone bridges) and with all types of potentiometers, to locate the null point on the wire.
How should a jockey be used on a bridge wire?
Press it lightly onto the wire and lift it again at each trial point. Do not slide it while pressed, as this damages the wire and makes its resistance per centimetre non-uniform.
What is the price of the pencil jockey?
Prices are not published on the website. Add the pencil jockey to the Enquiry Cart with the Add To Cart button on this page, or email [email protected] with the house code EL-EAE-10291 and the quantity, to receive a quotation.
Does Lab Exports manufacture the pencil jockey?
Yes. Lab Exports manufactures the pencil jockey at its works at 11/315, Lalita Park, Laxmi Nagar, Delhi 110092, under house code EL-EAE-10291.
Request a quote
Email [email protected] with the house code EL-EAE-10291 and the quantity, or add the pencil jockey to the Enquiry Cart with the Add To Cart button on this page. Tender buyers can also see the Tenders and OEM page.
