Quick Answer: The Parallelogram Law Apparatus (Gravesand) is a board of about 650mm x 500mm with pulleys on low-friction bearings for verifying the parallelogram law of forces and Lami’s theorem.
Last updated: October 2026
Key Features
Board approx. 650mm x 500mm
Pulleys running on low-friction bearings
For the parallelogram law of forces and Lami’s theorem
Technical Specifications
Specification
Value
Board size
650mm x 500mm (approximate)
Pulleys
Low-friction bearings
Experiments
Parallelogram law of forces, Lami’s theorem
About This Product
Students balance forces through the pulleys and draw the force vectors to scale on the board, checking that two forces combine by the parallelogram rule and that forces in equilibrium satisfy Lami’s theorem. Educational Instrument can arrange export supply of the Parallelogram Law Apparatus | Gravesand to Peru, Niger, France, Angola, United Arab Emirates and Palestine.
Frequently Asked Questions
Which laws can be verified with the Parallelogram Law Apparatus (Gravesand)?
The parallelogram law of forces and Lami’s theorem, using the board and its pulleys on low-friction bearings.
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