Wave Motion Powell’s Wave Demonstrator
.png)
Product Code : SCL-PL-12123
Wave Motion Powell’s Wave Demonstrator (SKU SCL-PL-12123) is a hand-cranked teaching model that turns rotary motion into a travelling row of coloured marker spheres, showing both transverse and longitudinal waves. It suits the wave chapters of Class 9 and Class 11 physics. Science Lab Supplies builds the demonstrator at its Plot 448 factory in the HSIIDC Industrial Area, Saha, Ambala, and quotes it directly to schools, colleges, distributors and tender contractors.
Specifications
The table lists the Powell’s demonstrator fact by fact. In short, a hand crank turns a crankshaft whose offset cams or bent wire linkages move a row of vertical rods tipped with marker spheres, inside a cast alloy and hardwood frame, and the mechanism runs without batteries or mains power.
| Specification | Value |
|---|---|
| SKU | SCL-PL-12123 |
| Operation | Manual hand-crank rotation |
| Drive | Multi-axis metal crankshaft |
| Linkages | Offset eccentric cams or bent wire linkages |
| Indicators | Vertical rods topped with high-contrast marker spheres |
| Marker count | Multi-rod array |
| Wave types shown | Transverse profiles and longitudinal compressions |
| Frame material | Cast alloy and finished hardwood components |
| Support frame | Rigid base with side panels |
| Power | None; battery-free, no electrical connection |
| Amplitude and wavelength | Fixed by the cam geometry |
| Frequency | Varied by cranking speed |
| Handle | Detachable or integrated manual operating handle |
| Condition on delivery | Fully assembled |
| Documentation | Classroom instructor guide with key wave experiments |
| Maintenance | Oil the crankshaft bearing points every six months |
| Manufacturer | Science Lab Supplies, Saha, Ambala, Haryana |
| Country of origin | India |
Applications and Experiments for the Powell’s Wave Demonstrator
The demonstrator lets a whole class watch a single particle oscillate while the wave shape moves along the row, which is the key idea in introductory wave theory. It supports NCERT Class 9 sound, Class 11 waves, and first-year B.Sc. lectures on progressive waves and phase.
- Class 9 science: contrasting transverse waves with the compressions and rarefactions of sound, then sounding a fork from the Eight-Piece Welch Pattern Tuning Fork Set.
- Class 11 physics: amplitude, wavelength, time period and phase in a progressive wave, before moving on to standing waves with Melde’s String Vibration Apparatus.
- Showing that a faster crank raises the frequency and brings the crests closer together.
Standard Scope of Supply
Each demonstrator is supplied fully assembled with its detachable or integrated operating handle and a classroom instructor guide that outlines the main wave experiments. No power supply is needed. Measuring items such as a metre rule can be placed on the same quotation if needed.
Packing, MOQ and Lead Time
A quotation can cover one demonstrator for a single classroom or several for a district order; Science Lab Supplies sets out packing, delivery time and price for that quantity. Other school physics lab equipment in India from the wave range can be listed on the same quotation.
Science Lab Supplies holds an Importer-Exporter Code and is able to ship to buyers in Kenya, Ghana, Ethiopia, Tanzania, Uganda and the UAE. A price for one demonstrator or a whole wave bench starts with a note on the contact page or an entry in the enquiry cart, while tender buyers can submit their schedule through the lab tender page.
Frequently Asked Questions
How does Powell’s wave demonstrator produce a travelling wave?
A single crankshaft carries offset cams that raise the rods one after another. Each sphere only moves up and down or to and fro, but the staggered timing makes the crest appear to travel along the row.
Does the demonstrator need electricity?
No. The apparatus is fully mechanical and is driven only by turning the hand crank, so it needs no batteries, mains socket or transformer at all.
Can the wavelength be changed?
Amplitude and wavelength are fixed by the geometry of the cams. Turning the crank faster or slower changes the frequency and the speed at which the wave appears to move.
Is Science Lab Supplies the manufacturer or a trader?
Every Powell’s demonstrator leaves the company’s own Saha, Ambala workshop fully assembled, so Science Lab Supplies is the manufacturer and quotes as a science apparatus manufacturer in India, not as a reseller.
Related Wave Motion Apparatus
These items show transverse and longitudinal waves with cams, springs, vibrating plates and water, so a teacher can move from a mechanical model to a real medium. All come from the Physics Lab range, and any of them can be quoted together with the demonstrator for a complete wave-motion bench.
- Wave Motion Apparatus Physics Lab — 30 tracking rods on a 600 x 150 x 300 mm steel and alloy frame.
- Wave Machine — 480 mm cam model whose handle carries a scale marked in degrees of rotation.
- Transverse and Longitudinal Wave using Slinky Physics Lab — flat-wire spring that stretches up to 3 m without permanent distortion.
- Apparatus for Demonstrating the Propagation of Waves — eccentric discs for transverse waves and bent rods for longitudinal ones.
- Apparatus for Demonstrating Waves with Elastic Springs — two springs plus 16 cam-driven rods with a degree scale for phase.
- Mechanical-Wave Apparatus Package — Chladni plates, spring, cord and a 1–4000 Hz sine-wave generator with driver.
- Wave Tank — self-contained unit set from 50 to 175 Hz in 1 Hz steps, with LED illumination.
- Ripple Tank kit — vibrator, LED strobe and a 30 x 33 cm screen for projected water waves.
Browse the full Physics Lab range or all physics lab equipment.
Last updated: 22 October 2026
