Card- clear mica with narrow rim and cross piece of green paper, graduated in black to 360 degs with two rows of figures, inner row erect for reading on edge of card nearest to observer, outer row very small and inverted for reading by prism.
Needle- Flat bar type with square ends, 4.75" (12.1cm) long. Has fine line engraved along centre of upper surface for setting true to graduations. Centre of needle has hole into which pivot cup is screwed. Underside of outer rim has several sealing wax blobs for balancing.
Pivot- Brass pivot cap fitted with jewel at top, screwed through centre hole of needle.