Torsion Pendulum (Bridge Type)

Product Code : LSK-AM-11091

Torsion Pendulum (Bridge Type) (SKU LSK-AM-11091) suspends a grooved aluminium disc from a tall U-shaped metal bridge, so the disc can twist freely on its wire. Physics students use it to determine the modulus of rigidity of a wire and to compare moments of inertia in B.Sc., engineering and polytechnic mechanics practicals. The bridge-type pendulum is built by Science Lab Supplies in its factory at Plot 448, HSIIDC Industrial Area, Saha, Ambala, India, which quotes schools, colleges, contractors and distributors directly.

Specifications

A split chuck fitted into the disc holds the wire and allows accurate suspension and torsion from the metal bridge. The main disc is aluminium with a grooved area, and a second, smaller disc of chrome-plated iron matches the inside diameter of that groove so it can be seated in it.

Applications and Experiments for the Bridge-Type Torsion Pendulum

This pendulum measures the rigidity modulus of a suspension wire from the time period of torsional oscillations, first with the aluminium disc alone and then with the iron disc added. It suits B.Sc. physics practicals, engineering physics labs and diploma courses where rotational dynamics and elasticity are taught together.

• B.Sc. physics: modulus of rigidity of a wire by the dynamical (torsion pendulum) method.
• Showing how adding a known disc changes the moment of inertia and the period.
• Engineering physics lab: torsional simple harmonic motion and the torsion constant.

Standard Scope of Supply

The set consists of the U-shaped metal bridge, the 15 cm aluminium disc with its split chuck, and the chrome-plated iron disc of about 8 cm diameter. The larger version pairs a 25 cm aluminium disc with a 10.5 cm iron disc; state which size you need so the quotation matches it.

Packing, MOQ and Lead Time

Ask for a price on a single pendulum or on enough sets for a whole practical batch. The quotation you receive lists packing, delivery time and price for that exact quantity, and other mechanics lab equipment in India from the Applied Mechanics range can be added to it.

Science Lab Supplies holds an Importer-Exporter Code and can ship to buyers in Ethiopia, Tanzania, Uganda, the UAE, Saudi Arabia and Oman. Send your list through the enquiry cart or the contact page; tender buyers can also refer to the lab tender page.

Frequently Asked Questions

How does the bridge type differ from the standard Torsion Pendulum?
This model hangs from a tall U-shaped metal bridge and uses a grooved aluminium disc with a chrome-plated iron disc, whereas the standard Torsion Pendulum uses a solid brass disc and brass ring on a universal clamp.

What is the small iron disc for?
The chrome-plated iron disc fits the inside diameter of the groove in the aluminium disc. Adding it changes the moment of inertia, so students can compare the periods with and without it when calculating the rigidity.

Which disc sizes are available?
The standard set has a 15 cm aluminium disc and an iron disc of about 8 cm diameter. A larger set has a 25 cm aluminium disc and a 10.5 cm iron disc, both iron discs being 1.25 cm thick.

Is Science Lab Supplies the manufacturer of this pendulum?
Yes. The bridge-type pendulum is fabricated at the company's Saha, Ambala plant in India, and every quotation is issued by the manufacturer itself rather than through a reseller.

Related Torsion and Inertia Apparatus

The four items below sit in the same Applied Mechanics group and support the rigidity and moment-of-inertia experiments done with this pendulum. They let a department run the dynamic and static rigidity methods side by side, and they can be included on one quotation with the bridge-type set.

• Torsion Pendulum — solid 12.5 cm brass disc with a brass ring.
• Inertia Disc — brass disc with a split chuck clamping arrangement.
• Maxwell Vibration Needle — another route to the rigidity of a wire.
• Torsion (Barton's) Apparatus Vertical Pattern — static torsion of a test rod.

Browse the full Applied Mechanics range or all physics lab equipment.

Last updated: 25 September 2026