Torsion Apparatus Searle's Type
Product Code : EL-AM-10319
Quick answer: The Torsion Apparatus Searle's Type is a horizontal bench apparatus in which a rod is clamped at one end and twisted at the other by a mass hung from a cord round a 165 mm grooved wheel. Two pointers over 30-0-30 degree brass scales read the twist. It is used to find the modulus of rigidity of brass and steel rods by the static method. Lab Exports manufactures it in Delhi for colleges, universities and schools.
Specifications
| Component | Specification |
|---|---|
| Pattern | Horizontal bench |
| Scales | Two brass scales, graduated 30-0-30 degrees, on adjustable pillar supports |
| Pointers | Two, with clamps for attaching to the specimen |
| Test rods | One brass rod and one steel rod |
| Wheel | 165 mm diameter, grooved, moving in ball bearings on the front foot |
| Chuck | Split collet chuck on the spindle, holding one end of the test rod |
| Rear support | Clamping block through the rear foot |
| Feet | Two cast iron feet, each with three through-holes and grub securing screws, joined by two supporting rods |
| Loading | Cord and hook for carrying masses (weights not included) |
| Option | Also available with a one-metre-long rod |
How the static torsion experiment is done
A mass M hung from the cord on the wheel of radius R applies a twisting couple M g R to the free end of the rod, while the rear end is held in the clamping block. Each pointer shows how far the rod has twisted at its position, and the difference between the two readings gives the angle of twist phi over the length l between the pointers, which avoids errors from any slip at the clamps.
- Clamp the test rod in the split collet chuck and the rear clamping block, and fix the two pointers on the rod a measured distance l apart.
- Set the scales on their pillars so that both pointers read zero with the hook unloaded.
- Hang masses on the hook in equal steps and record both pointer readings while loading and unloading.
- Convert the difference between the pointer readings to radians to get the twist phi for each load.
- Measure the rod radius r at several places and calculate eta = 2 M g R l / (pi r^4 phi).
A graph of phi against M is a straight line through the origin, and its slope gives the mean value of eta. Repeating with the second rod compares the rigidity of brass and steel.
Key features
- Horizontal bench pattern on two cast iron feet with grub securing screws
- 165 mm grooved wheel running in ball bearings for smooth loading
- Split collet chuck on the spindle grips one end of the rod
- Two brass scales, 30-0-30 degrees, on adjustable pillars, with two pointers
- Brass and steel test rods supplied; one-metre rod version available
Documentation and supply
Installation instructions and a manual are supplied with the apparatus. Most Lab Exports products carry a one-year manufacturer warranty.
Lab Exports manufactures the Searle's torsion apparatus at its works in Laxmi Nagar, Delhi, and supplies it to colleges, universities and schools in India and 60+ countries, handling the export documents for each shipment. More about the company is on the About Lab Exports page.
Related Applied Mechanics products
- Torsion Pendulum (Bridge Type) (EL-AM-10318)
- Torsion (Barton's) Apparatus Vertical Pattern (EL-AM-10320)
- Torsion Pendulum (EL-AM-10317)
- Bending of Beam Apparatus (EL-AM-10321)
- Fly Wheel (EL-AM-10316)
- Bending of Beam Apparatus, Koenig's Method (EL-AM-10322)
The full range is in the Applied Mechanics section of the Physics Lab range.
Frequently asked questions
What test rods come with the Searle's torsion apparatus?
One brass rod and one steel rod are supplied; a version with a one-metre-long rod is also available.
What is the scale range of the torsion apparatus?
Two brass scales are graduated 30-0-30 degrees and mounted on adjustable pillar supports.
Are weights included with the Searle's type torsion apparatus?
No. A cord and hook for carrying masses are supplied, but the weights are not included.
What is the price of the Searle's torsion apparatus?
Prices are not published on the website. Add the Searle's torsion apparatus to the Enquiry Cart with the Add To Cart button on this page, or email [email protected] with the house code EL-AM-10319 and the quantity, to receive a quotation.
Does Lab Exports manufacture the Searle's torsion apparatus?
Yes. Lab Exports manufactures the Searle's torsion apparatus at its works at 11/315, Lalita Park, Laxmi Nagar, Delhi 110092, under house code EL-AM-10319.
Request a quote
Email [email protected] with the house code EL-AM-10319 and the quantity, or add the Searle's torsion apparatus to the Enquiry Cart with the Add To Cart button on this page. Tender buyers can also see the Tenders and OEM page.
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