Quick Answer: The Rigidity Apparatus (Searle’s Pattern) measures the modulus of rigidity of a wire by the dynamic method, with two identical 300 mm brass frames joined by the specimen wire. Two solid and two hollow brass cylinders change the moment of inertia.
Last updated: October 2026
Key Features
Two identical brass frames, 300 mm (30 cm) each
Frames joined by the specimen wire, held in clamping chucks
Two solid and two hollow brass cylinders of matched size
Cylinders change the inertia between runs
Technical Specifications
Specification
Value
Frames
Two, brass, 300 mm each
Connection
Specimen wire in hardened clamping chucks
Inertia masses
Two solid and two hollow brass cylinders
Method
Dynamic torsional oscillation
About This Product
The two frames are set swinging in opposite directions, twisting the wire between them, and the period is timed first with the solid cylinders and then with the hollow ones. Comparing the periods with the known masses and sizes gives the modulus of rigidity of the wire.
Frequently Asked Questions
What masses come with the Rigidity Apparatus (Searle’s Pattern)?
It has two solid and two hollow brass cylinders of matched dimensions, used on the two 300 mm frames.
