Melde's String Vibration Apparatus
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Product Code : SCL-PL-12062
Melde's String Vibration Apparatus (SKU SCL-PL-12062) uses an electromechanical vibrator to set a stretched nylon cord into standing-wave vibration, so students can relate tension, frequency and linear mass density. The vibrator runs from a 6–12 V AC supply at line frequency. It suits B.Sc. and engineering physics practicals and senior secondary wave demonstrations. Every set is manufactured by Science Lab Supplies at Plot 448, HSIIDC Industrial Area, Saha, Ambala, India, and quoted from the factory to schools, colleges, tender contractors and distributors.
Specifications
Vibrator, base, cord and mass data for Melde’s set are split into single rows in the table below. In short, an electromechanical vibrator on a powder-coated cast-iron base runs from 6–12 V AC at 50 or 60 Hz, and a table-clamp pulley guides a braided nylon cord to a 100 g hanger and mass set.
| Specification | Value |
|---|---|
| SKU | SCL-PL-12062 |
| Vibrator | Electromechanical, with vibrator blade |
| Operating voltage | 6–12 V AC |
| Connection | Safety terminals (electrical terminal posts) |
| Vibration frequency | 50 Hz or 60 Hz, synchronised with line frequency |
| Base | Powder-coated cast iron |
| Feet | Rubber vibration-damping feet |
| Pulley | Adjustable table-clamp pulley assembly |
| Cord | High-tensile braided nylon, on a spool |
| Slotted masses | 10 g to 50 g |
| Mass material | Brass or steel |
| Total mass | 100 g set with hanger |
| Arrangements | Parallel and perpendicular |
| Literature | Instruction manual with sample experiments |
| Manufacturer | Science Lab Supplies, Saha, Ambala, Haryana |
| Country of origin | India |
Applications and Experiments for Melde's Apparatus
Melde's experiment finds the frequency of the vibrator, and hence of the AC mains, from the loop length of a standing wave on a cord of known tension and mass per unit length. The set supports B.Sc. and engineering physics practicals and Class 11–12 wave demonstrations.
- B.Sc. practical: determining the frequency of AC mains using Melde's arrangement.
- Showing nodes, antinodes and loop patterns of standing waves.
- Comparing the parallel and perpendicular (longitudinal and transverse) arrangements of the vibrator.
- Verifying that loop length grows with the square root of tension, with each loop measured on a Wooden Ruler 1 Metre.
Connect the vibrator only to a 6–12 V AC source such as a step-down transformer, never directly to the mains, and do not exceed the voltage marked on its terminals.
Standard Scope of Supply
The kit contains the electromechanical vibrator unit with terminal posts, the adjustable table-clamp pulley assembly, the slotted weight set with hanger, a spool of braided nylon string and an instruction manual with sample experiments. A low-voltage AC supply for the vibrator can be added to the same quotation.
Packing, MOQ and Lead Time
You can ask for a single apparatus or a batch for a college physics laboratory, and the quotation will show packing, delivery time and price for that quantity. As a physics instruments supplier in India, Science Lab Supplies can include related wave items on it.
Science Lab Supplies holds an Importer-Exporter Code as a registered exporter and can ship to buyers in the UAE, Saudi Arabia, Oman, the Philippines, Nepal and Bangladesh. College laboratories can ask for Melde’s set on the contact page, combine it with other wave items in the enquiry cart, or check the lab tender page when a tender is planned.
Frequently Asked Questions
What power supply does Melde's apparatus need?
It needs a low-voltage 6–12 V AC supply connected to the vibrator's safety terminals. The AC/DC Laboratory Power Supply, with AC output steps of 1–15 V, is one source that can be set within that range.
At what frequency does the vibrator work?
It vibrates at 50 Hz or 60 Hz, following the frequency of the electrical line that feeds the supply, which is why the experiment can be used to find the mains frequency.
Is Science Lab Supplies the manufacturer or a trader?
Melde’s vibrator, pulley and mass set are built at the Science Lab Supplies factory in Saha, Ambala, India. As their manufacturer, the company handles every quotation itself, without traders in between.
What masses are supplied for tension?
Slotted brass or steel masses from 10 g to 50 g are supplied on a hanger, making up a 100 g set, so the tension in the cord can be raised in small steps.
Related String and Resonance Apparatus
Standing waves on strings sit alongside sonometer, tuning-fork and resonance-tube work in a wave practical course. These Physics Lab items cover those experiments, plus two vibration drivers and a mechanical-wave package, and can be quoted together with Melde’s set on one sheet.
- Apparatus for Investigating the Change of Frequency of Stationary Waves in a String — wave generator with an input-signal generator, elastic cord, fixed pulley and connecting bridge.
- Sonometers — 110 x 10 x 8.5 cm wooden sonometer with steel cords and three movable bridges.
- Eight-Piece Welch Pattern Tuning Fork Set — eight aluminium-alloy forks across a diatonic octave, each stem stamped with frequency and note.
- Resonance Apparatus Brass Pipe — brass air-column pipe for measuring the velocity of sound in air.
- Electromagnetic Driver for Sonometer — non-contact coil driver with a 6 V RMS maximum input and 25 mm height adjustment.
- Vibration Generator — fuse-protected coil driver with a transit lock, 100 x 100 x 120 mm.
- Mechanical-Wave Apparatus Package — mechanical wave driver, 7 ft elastic cord and a sine-wave generator from 1 Hz.
Browse the full Physics Lab range or all physics lab equipment.
Last updated: 22 October 2026
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