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Date: |
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Description: | 6/18 MARK III No 1044D
THE CAMPBELL-BENNETT APERIODIC COMPASS 6/18 MARK III PATD> GREAT BRITAIN 27.618 No 127136 U.S.A. 25.6.20 No 1341296
Aperiodic compass
Bowl: Brass, painted grey. Filler plug attached to side, expansion chamber fitted to base, an aperture is provided to illuminate spider (blocked off). Mounted in anti-vibration frame incorporating four leaf springs and four location struts. Interior of bowl painted white, fitted with a short black wire lubber line. Rotatable verge ring, N point marked with red triangle and graduated to 1-36 (360 degrees), carries four parallel wires for grid steering. Fitted with two locking devices, to prevent verge ring being turned accidentally.
Card: Wire spider of eight elements. North point marked with letter N and wings in red, S E and W marked in black.
Needle: Six needle magnets slung below spider.
Pivot: Of inverted type, unsighted, presumably having pivot pin on underside of float which engages in pivot cap carried on stem which is attached to base of bowl by a curved disc.
O.A height 4.75" (12cm)
Inscription.
caption: Record Shot - Do not reproduce. | Publisher: | "http://collections.rmg.co.uk/" | Rights holder: | "Royal Museums Greenwich" | Subjects: | aperiodic compasses | Source: | Royal Museums Greenwich | Identifier: | http://collections.rmg.co.uk/collections... | Go to resource |
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