Card-Mica covered with paper, blue with black and blue markings, graduated to 1/4 points and quadrantally in degrees.
Needle- Four heavy bar edge needles, of rolled and hammered steel. The two central needles 7.25" long each of four laminations, 0.5" deep at ends having a semi-circular swell at centre 1.5" deep. The two outer needles are 5.25" long and 0.5" deep. Mounted 2" apart and attached to a light metal ring which is screwed to the card.
Pivot- Cone-shaped brass pivot cap with jewel at top, screwed through centre of light metal framework which has two short arms secured to the two inner needles and two long arms attached to the metal ring of card in the N-S direction, these carrying sliding weights.