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Apparatus Young Modulus Searle's
Apparatus Young Modulus Searle's (Product Code: SLE/PHY/17) is a twin-frame extension apparatus used to determine the Young's modulus of a wire by Searle's method in college and senior-secondary physics labs. Two hinged cast metal frames, a spirit level on a pivoted cross-bar and a micrometer head reading to 0.01 mm let students measure very small extensions; brass and steel wires are included. It is made by Jain Scientific Equipments Pvt Ltd (ScienceLab), an OEM manufacturer, at its own factory in Ambala, India.
Specifications
| Parameter | Detail |
|---|---|
| Measures | Young's modulus (modulus of elasticity) of a wire: for small strains, the ratio of the rate of change of stress with strain |
| Frames | Two cast metal rectangular frames, hinged together parallel to each other so that only vertical relative motion is possible |
| Reference indicator | Spirit level fixed on a cross-bar pivoted across the frames |
| Wire and load fittings | Self-centering chuck at the upper end of each frame for holding the wire; load hook at the lower end of each frame |
| Scale | Vertical scale 10 – 0 – 10 mm on one frame |
| Micrometer | Micrometer head along the scale, reading to 0.01 mm, for adjusting the spirit level |
| Also included | Ceiling bracket carrying a pair of chucks; counterpoise weight; set of two wires, one brass and one steel |
| Product code | SLE/PHY/17 |
| Manufacturer | Jain Scientific Equipments Pvt Ltd (ScienceLab) — OEM |
| Country of origin | India (made in Ambala, Haryana) |
What Is the Searle's Young Modulus Apparatus Used For?
Young's modulus tells us how stiff a material is, and Searle's method measures it on a long, thin wire. The two wires hang from the chucks of the ceiling bracket and pass into the self-centering chucks of the two frames. One frame carries the counterpoise weight to keep its wire taut as a reference, while load is added to the hook of the other. Because the frames are hinged to move only vertically, any stretch of the loaded wire tilts the spirit level on the cross-bar.
After each load change, the micrometer head is turned until the bubble is level again, and the change in reading gives the extension to 0.01 mm. Plotting load against extension, then using the wire's length and diameter, gives Young's modulus as stress divided by strain. The Searle's method Young's modulus experiment is a standard practical in India's senior-secondary (including CBSE class 11) and undergraduate physics courses. Add and remove load gently, and stay well within the elastic limit so the wire returns to its original length.
What to Specify When Ordering
- Number of complete apparatus sets required for the lab.
- Whether you need extra brass or steel wires beyond the set of two supplied.
- Loading weights and hanger, which are not listed in the kit contents.
- Mounting: the kit includes a ceiling bracket; mention it if a wall mounting suits your lab better.
OEM Manufacturer
The Apparatus Young Modulus Searle's is an OEM product of Jain Scientific Equipments Private Limited, the company that trades as ScienceLab. It is manufactured as a complete apparatus at the company's own licensed factory at Saha, Ambala, Haryana, India, and dispatched factory-direct to universities, colleges, schools, dealers and importers. Replacement wires or chucks and repeat orders can be requested from the manufacturer itself — just ask us. Visit the ScienceLab profile to learn more.
Related Physics Lab Equipment
A Searle's experiment also needs loading and measuring items such as:
- Hangers with Slotted Weights — to load the experimental wire in equal steps.
- Micrometer Screw Gauge, Lock Type — for measuring the wire diameter to find its cross-sectional area.
- Meter Stick, White — for measuring the original length of the wire.
- Wall Mount For Searle Apparatus — an alternative mounting where a ceiling fixing is impractical.
- Searle's Apparatus — another Searle's apparatus listing in the physics range.
More instruments are listed in Physics Lab Equipment.
Frequently Asked Questions
What is the Apparatus Young Modulus Searle's used to measure?
The Apparatus Young Modulus Searle's measures the Young's modulus of a wire, a measure of the stiffness of its material. The extension of a loaded wire is compared with a reference wire, and the micrometer reading after re-levelling the spirit level gives the extension.
How accurate is the micrometer on the Searle's apparatus?
The micrometer head on the Apparatus Young Modulus Searle's reads to 0.01 mm. It runs along a vertical scale of 10 – 0 – 10 mm on one frame and is used to bring the spirit level back to level after each change of load.
Which wires are supplied with the Apparatus Young Modulus Searle's?
The Apparatus Young Modulus Searle's includes a set of two wires, one of brass and one of steel, together with a ceiling bracket carrying a pair of chucks and a counterpoise weight. Each frame has a self-centering chuck to grip its wire.
Who manufactures the Apparatus Young Modulus Searle's?
Jain Scientific Equipments Pvt Ltd, trading as ScienceLab, manufactures the Apparatus Young Modulus Searle's as the OEM at its own factory in Saha, Ambala, Haryana, India. Colleges and dealers order it direct from the manufacturer, who also handles requests for spare wires.
Are slotted weights included with the Searle's apparatus?
Slotted weights are not listed among the contents of the Apparatus Young Modulus Searle's, which lists a counterpoise weight for the reference frame. Order a hanger with slotted weights separately, or ask ScienceLab to include suitable weights in the same quotation.
Can a calibration certificate be supplied for the micrometer?
Availability of any calibration document for the micrometer of the Apparatus Young Modulus Searle's should be discussed with ScienceLab before you order. State this requirement, the number of sets and your delivery location in your enquiry through the contact page.
Request a Quote
To receive a quotation for the Apparatus Young Modulus Searle's, write to us through the contact page or add it to the enquiry cart along with weights and measuring instruments. Quotes come straight from ScienceLab as the manufacturer.
Last updated: 24 September 2026
