50 mm x 50mm magnetic square rubber sheet.
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Made of steel 12 mm diameter, in pairs, half red & half blue (for N & S), spray painted, with keepers.
Plotting Compass Glass for Physics Lab – Magnetic needle mounted on pivot in aluminium case with both sides glass with cross lines at 90°. (a) 20 mm (b) 25 mm (c) 50 mm.
Bell Electric for Physics Lab – With detachable plastic cover, dome gong. For use on 3 to 12 V AC/DC supplies.
Mariner’s Compass for Physics Lab – Magnetic needle in Aluminium bowl with gimbals in polished wooden box with sliding cover, dia 75 mm approx
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