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Law of Parallelogram Apparatus (Grave Sand Apparatus)
Law of Parallelogram Apparatus (Grave Sand Apparatus) (Product Code: SCL218/09) is a force board used to verify the parallelogram law of vector addition of forces in school and college physics labs. It has a board of about 65 x 50 cm, two 50 mm aluminium pulleys that clamp anywhere on the board, three mass hangers and twelve 50 g brass slotted masses, with a stand. It is made by Jain Scientific Equipments Pvt Ltd (ScienceLab), an OEM manufacturer, at its own factory in Ambala, India.
Specifications
| Parameter | Detail |
|---|---|
| Board size | About 65 x 50 cm |
| Pulleys | Two, aluminium, 50 mm diameter, on clamps |
| Pulley mounting | Clamps fix the pulleys on the board at any desired position |
| Mass hangers | Three |
| Slotted masses | 12 x 50 g |
| Mass material | Brass |
| Stand | Supplied |
| Product code | SCL218/09 |
| Manufacturer | Jain Scientific Equipments Pvt Ltd (ScienceLab) — OEM |
| Country of origin | India (made in Ambala, Haryana) |
What Is the Parallelogram Law Apparatus Used For?
Often called Gravesand's apparatus, the board is set upright on its stand with a sheet of paper pinned to it. A thread passes over both pulleys with a hanger at each end, and a third hanger is tied to the thread between them. When the three loads come to rest, students mark the thread directions, draw two forces to scale as adjacent sides of a parallelogram and check that the diagonal matches the third load in size and direction.
Moving the clamped pulleys changes the angles, so each group can repeat the test with new settings; the same set-up can also find an unknown weight. Tap the board gently before marking to reduce pulley friction, and keep the knot and hangers clear of the board. It is standard mechanics lab equipment for the vector-addition practical in senior school physics.
What to Specify When Ordering
- Number of complete sets, each with board, two pulleys, three hangers, twelve 50 g masses and stand.
- Whether extra 50 g slotted masses or hangers should be quoted for heavier loads.
- Consumables for plotting, such as thread and board pins, if you want them in the same order.
OEM Manufacturer
Jain Scientific Equipments Private Limited, trading as ScienceLab, is the OEM (original equipment manufacturer) of the Law of Parallelogram Apparatus (Grave Sand Apparatus). The board, pulley clamps, hangers and masses are assembled into a set at the company's own licensed factory at Saha, Ambala, Haryana, India, and supplied direct to schools, colleges, dealers and importers.
Dealing with the manufacturer means spare hangers, extra masses or a replacement pulley can be asked for from the same source that built the set — just ask us. The ScienceLab profile has more about the company.
Related Physics Lab Equipment
Items that complete the parallelogram-law practical:
- Hangers with Slotted Weights — additional hangers and masses for larger loads.
- Cotton Thread Roll — thread to run over the pulleys.
- Board Pin Packet — pins the paper sheet to the board.
- D Scale for Measuring Angles — measures the angles between the threads.
- Meter Scale 50 cm — draws the force lines to scale.
See the Physics Lab category for other mechanics apparatus.
Frequently Asked Questions
What is included with the Law of Parallelogram Apparatus (Grave Sand Apparatus)?
The Law of Parallelogram Apparatus (Grave Sand Apparatus) includes a board of about 65 x 50 cm, two 50 mm aluminium pulleys on clamps, three mass hangers, twelve 50 g brass slotted masses and a stand.
What does the Law of Parallelogram Apparatus (Grave Sand Apparatus) demonstrate?
The Law of Parallelogram Apparatus (Grave Sand Apparatus) demonstrates that when two forces acting at a point are drawn as adjacent sides of a parallelogram, the diagonal from that point gives their resultant in magnitude and direction.
Can the pulleys on the Law of Parallelogram Apparatus (Grave Sand Apparatus) be moved?
Yes. The two aluminium pulleys of the Law of Parallelogram Apparatus (Grave Sand Apparatus) sit on clamps that fix them to the board at any desired position, so students can change the angle between the forces for repeat readings.
Who manufactures the Law of Parallelogram Apparatus (Grave Sand Apparatus)?
The Law of Parallelogram Apparatus (Grave Sand Apparatus) is manufactured by Jain Scientific Equipments Pvt Ltd (ScienceLab), the OEM, at its own factory at Saha, Ambala, Haryana, India. Quotations are issued directly by the manufacturer.
What should a quotation request for the Law of Parallelogram Apparatus (Grave Sand Apparatus) include?
A quotation request for the Law of Parallelogram Apparatus (Grave Sand Apparatus) should give product code SCL218/09, the number of sets, any extra 50 g masses or hangers, and the delivery location. Send it through https://scilabexport.com/contact.
Request a Quote
To order the Law of Parallelogram Apparatus (Grave Sand Apparatus), use the contact page or add it to the enquiry cart. You will receive the quotation directly from the manufacturer in Ambala.
Last updated: 24 September 2026
