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Date: |
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Description: | 14 S
B.13.S 1839.33 0-30' Barrow 1848/No14/71/4 Barrow 1848/No 14
Card-Mica covered with paper, white with black and white markings, graduated to 1/4 points. At centre of card is a hole 2" diameter to accommodate pivot gimbal.
Needle- Four heavy edge bar needles of rolled and hammered steel. The two central needles 6.5" long, each of four laminations, 0.5" deep at ends, having a semi-circular swell at the centre 1.25" deep. The two outer needles are 4" long and 0.5" deep and have two lamintations each. Mounted 2" apart and attached to a light metal ring which is screwed to the card.
Pivot - Inverted type (missing) mounted in a gimbal ring 1.75" dia. attached to the two cemtral needles by brass brackets. A very heavy gunmetal bell-shaped weight, dia. 1.75", is attached to centre of card, below pivot gimbal by two thumb screws so as to be detachable.
DRY EXPERIMENTAL
caption: Record Shot - Do not reproduce. | Publisher: | "http://collections.rmg.co.uk/" | Rights holder: | "Royal Museums Greenwich" | Source: | Royal Museums Greenwich | Identifier: | http://collections.rmg.co.uk/collections... | Go to resource |
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