Torsion (Barton's) Apparatus Vertical Pattern
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Product Code : EL-AM-10320
Quick answer: The Torsion (Barton's) Apparatus Vertical Pattern holds a 900 mm, 5 mm diameter test rod upright between a 3-jaw chuck and a torsional drum, which is turned by loading a scale pan over two frictionless pulleys. Three pointers and sliding circular scales in single degrees read the twist. It is used to find the modulus of rigidity by the static method. Lab Exports manufactures it in Delhi for colleges, universities and schools.
Specifications
| Component | Specification |
|---|---|
| Frame | Steel, on a heavy cast iron base with levelling screws |
| Test rod | 900 mm long, 5 mm diameter |
| Upper clamp | 3-jaw chuck |
| Lower end | Clamped into the axis of a torsional drum |
| Loading | Scale pan passing over two frictionless pulleys rotates the drum |
| Pointers | Three, for clamping to the test rod |
| Scales | Three freely sliding circular scales, single-degree graduations, clampable at any position |
| Supplied with | Three test rods, strings, two scale pans |
| Weights | Not included |
How the torsion experiment is done
With the rod vertical, a load on the scale pan produces a couple on the drum that twists the rod about its own axis. For a rod of radius r, a couple C acting over a length l produces a twist phi = 2 C l / (pi eta r^4). Reading the twist at three heights shows that phi grows in proportion to the distance from the fixed chuck, and the slope of that line gives the modulus of rigidity eta.
- Level the cast iron base with the levelling screws so that the rod stands truly vertical.
- Clamp the rod in the 3-jaw chuck and in the drum axis, then fix the three pointers at measured distances along it.
- Slide each circular scale to its pointer, clamp it, and note the zero readings.
- Load the scale pan in equal steps and record the angle at each pointer, then unload and read again.
- Plot the twist at each pointer against its distance from the chuck and calculate eta from the couple and the rod radius.
Key features
- Vertical pattern: steel frame on a heavy cast iron base with levelling screws
- Test rod 900 mm long and 5 mm in diameter, held in a 3-jaw chuck
- Torsional drum loaded through two frictionless pulleys
- Three pointers and three sliding circular scales in single degrees, clampable at any position
- Three test rods, strings and two scale pans supplied; weights are ordered separately
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 Barton'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 Apparatus Searle's Type (EL-AM-10319)
- Bending of Beam Apparatus (EL-AM-10321)
- Torsion Pendulum (Bridge Type) (EL-AM-10318)
- Bending of Beam Apparatus, Koenig's Method (EL-AM-10322)
- Torsion Pendulum (EL-AM-10317)
- Cantilever Apparatus (EL-AM-10323)
The full range is in the Applied Mechanics section of the Physics Lab range.
Frequently asked questions
What size are the test rods of the Barton's torsion apparatus?
Each rod is 900 mm long and 5 mm in diameter; three test rods are supplied.
How is the drum of the Barton's apparatus rotated?
By loading a scale pan that passes over two frictionless pulleys, which turns the torsional drum clamped to the lower end of the rod.
Are weights included with the Barton's torsion apparatus?
No. The apparatus is complete with three test rods, strings and two scale pans, but weights are not supplied.
What is the price of the Barton's torsion apparatus?
Prices are not published on the website. Add the Barton'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-10320 and the quantity, to receive a quotation.
Does Lab Exports manufacture the Barton's torsion apparatus?
Yes. Lab Exports manufactures the Barton's torsion apparatus at its works at 11/315, Lalita Park, Laxmi Nagar, Delhi 110092, under house code EL-AM-10320.
Request a quote
Email [email protected] with the house code EL-AM-10320 and the quantity, or add the Barton'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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