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GP-636.1 PLOTTING COMPASS In metal case, with card dial, dia 20mm.  GP-637.2 MAGNET FIELD CHAMBER Three, dimensionl nature of the magnetic field around bar magnets, or suitably sized solenoid coils to be observed. Comprising an acrylic chamber, overall dimension 163 x 98 x 98mm, containing fine iron fillings suspended in silicone oil. The chamber also incorporates an internal 'tunnel', 163 x 25mm length x diameter, into which bar magnets or narrow coils may be inserted. Magnets of other shapes may be investigated by simply positioning their poles near to one side of the chamber.  GP-638.1 PLOTTING COMPASS BOTH SIDE GLASS With needle pivoted between top and bottom glass plates, with points of the compass and degrees.  GP-639.1 POCKET COMPASS In metal case 43mm dia marked with points of the compass and degrees with cover.  GP-641.1 COMPASS 43 diameter, graduated in degrees and with compass points marked. In plastic case with hinged cover and ring for lineyard. A locking mechanism protects the needle during transport. Page : 1 | 2 | 3 | 4 | 5 | 6 | 7 |