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On stand revolving in pivots, with a graduated quadrant, rotatable on a base marked every 45°.

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Comprising a circular scale 75 mm dia, graduated 0-90° four times, supported on a rectangular base. The needle is carefully balanced on steel pivots in brass bearing. Complete with base.

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An accurately balanced magnetic needle, with hardened steel pivots, in jewelled bearings. The needle can be removed for reversal. With a vertical circular scale marked 0-90° in four quadrants, in a non-magnetic metal case rotating about its vertical axis on a brass scale with vernier which reads to 0.1°.