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The Big Magnetic Compass supplied by IBEX SCIENCES is an oversized, highly visible educational instrument used in physics laboratories, geography classrooms, and field surveys. Unlike tiny pocket compasses, this “big” version is specifically designed for group demonstrations so that students can easily see the needle’s movement from a distance. [1, 2, 3]
Key Specifications & Design
- Oversized Dial: Typically features a large diameter ranging from 75mm to 100mm (or larger) for clear, long-distance viewing. [1]
- Clear Housing: Enclosed in a heavy-duty, transparent glass or clear plastic top casing that allows students to view internal mechanics easily.
- Magnetic Needle: Built with a highly responsive, color-coded steel needle (usually painted red for North and black/blue for South).
- Markings: Features a full 360-degree directional dial with bold labels for cardinal points (North, South, East, West) and intermediate headings.
Primary Applications in Education
- Earth’s Magnetic Field: Demonstrating the concept of geomagnetism and showing how the horizontal component of the Earth’s field aligns the needle. [1]
- Electromagnetism Experiments: Used alongside wires and batteries (like in Oersted’s Experiment) to show how an electric current creates a magnetic field that deflects the compass needle.
- Mapping & Navigation Basics: Teaching students how to orient a physical map and read basic geographic headings. [1]
Important Physics Lab Safety & Care
- Keep Away from Strong Magnets: Do not store the large compass near powerful neodymium magnets or heavy lab electronic equipment. Strong external fields can permanently weaken or reverse the compass needle’s built-in magnetic properties. [1]
- Avoid Steel Benches: Always use the compass on wooden, plastic, or resin lab tables. Placing it directly on a steel or iron frame table can warp the readings because the metal distorts local magnetic lines.
- Store Flat: Store the instrument horizontally to minimize wear and tear on the delicate central jeweled pivot point. [1]
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