The Parallelogram Apparatus is a physics laboratory instrument used to verify the law of parallelogram of forces. It consists of a graduated board with pulleys, weights, and strings arranged to demonstrate how two forces acting at a point can be represented as the sides of a parallelogram, with the resultant shown by the diagonal. Students can apply different weights and angles to observe force resolution and equilibrium conditions practically. The apparatus is designed with a sturdy frame and smooth pulleys for accurate results. It is widely used in school and college physics labs to help learners clearly understand vector addition and fundamental mechanics concepts.

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