Quick Answer: The Compass, Magnetic Plotting is a small pivoted-needle compass in an aluminium or brass case with a glass or acrylic cover, for tracing magnetic field lines. It is made in 12 mm, 15 mm and 20 mm diameters.
Last updated: October 2026
Key Features
Hardened, magnetised steel needle on a pivot
Aluminium or brass housing with glass or acrylic cover
Dial with 8 direction markers
Available in 12 mm, 15 mm and 20 mm diameters
Technical Specifications
Specification
Value
Housing
Aluminium or brass
Cover
Glass or acrylic
Needle
Hardened steel, magnetised, pivot-mounted
Dial
8-point direction markers
Diameter
12 mm, 15 mm or 20 mm
About This Product
A plotting compass is moved step by step around a magnet, with the needle direction marked at each position, to build up the shape of the field on paper. It is used this way with both bar and horseshoe magnets. Educational Instrument can arrange export supply of the Compass, Magnetic Plotting to Zambia, Sri Lanka, Tajikistan, Honduras, Guyana and Montenegro.
Frequently Asked Questions
What sizes does the Compass, Magnetic Plotting come in?
It is available in 12 mm, 15 mm and 20 mm diameters.