Searle's Apparatus Manufacturer,Supplier and Exporter in India
Product Code : EL-PL-12254
Jlab Export is a leading Searle's Apparatus Manufacturer,and suppliers in India
Searle’s Apparatus (code EL-PL-12254) is a two-wire apparatus for measuring the Young modulus of a wire: two cast metal frames, hinged parallel so they can only move vertically relative to each other, carry a spirit level on a pivoted cross-bar and a micrometer head reading to 0.01 mm. A ceiling bracket, a counterpoise weight and one brass and one steel wire come with it. Each set is built by JLab in Ambala, India.
Specifications
| Parameter | Detail |
|---|---|
| Model | JL248/023 |
| Frames | Two cast metal rectangular frames, hinged parallel; vertical relative motion only |
| Reference level | Spirit level on a cross-bar pivoted across the frames |
| Scale | Vertical scale 10–0–10 mm on one frame |
| Micrometer | Micrometer head reading to 0.01 mm, for re-levelling the spirit level |
| Wire fixing | Self-centring chuck at the top of each frame; load hook at the bottom |
| Supplied with | Ceiling bracket, counterpoise weight, one brass wire and one steel wire |
| Quality check | Each apparatus is visually inspected before dispatch |
| Pack quantity | Each (sold individually) |
| Minimum order quantity | 10 units |
| Dispatch time | Usually 4–6 working days |
| Product code | EL-PL-12254 |
| Manufacturer | Jain Laboratory Instruments Pvt Ltd (JLab) — OEM |
| Country of origin | India (made in Ambala, Haryana) |
How the Two Frames Measure Extension
Each wire hangs from the bracket and is gripped in the chuck at the top of its frame. The reference wire carries the counterpoise weight, which keeps it taut, while the test wire takes the load on its hook. Before loading, turn the micrometer until the bubble of the spirit level is centred and note the reading.
When a load is added, the test wire stretches and its frame drops slightly against the other, tilting the cross-bar. Turning the micrometer to centre the bubble again gives a new reading, and the difference between the two readings is the extension. Because both wires share one support and the same room temperature, any sag of the support or thermal expansion shows on both sides and cancels out.
Working Out the Young Modulus
Measure the test wire’s length between its fixings with a metre scale and its diameter with a screw gauge at several points, taking the mean. Add the load in equal steps, reading the micrometer each time, then remove it in the same steps: if the readings return, the wire stayed within its elastic limit. The Young modulus is E = FL / (Ae), where F is the load in newtons, L the length, A the cross-sectional area (πd²/4) and e the extension; the slope of a load–extension graph gives F/e directly.
Related Items for Elasticity Practicals
- Wall Mount For Searle Apparatus — bracket for hanging the apparatus from a wall instead of the ceiling.
- Steel Wire — plain steel wire for a replacement test wire.
- Screw Gauge — micrometer for the wire diameter at several points along it.
- Hangers with Slotted Weights — chrome-plated iron hanger with slotted weight for the load hook.
For other mechanics and properties-of-matter apparatus, see Physics Lab.
Request a Quote
Ask for a quotation through the contact page, or use Add To Cart; include the number of sets, model JL248/023 and the destination for delivery.
Last updated: 26 October 2026
