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Type 6/18 Mark III
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)
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)
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Object Details
| ID: | ACO0320 |
|---|---|
| Type: | Aperiodic compass - aircraft |
| Display location: | Not on display |
| Creator: | Bennett, Dr. G. T.; Campbell, Colin |
| Date made: | 1922 |
| Credit: | National Maritime Museum, Greenwich, London, Admiralty Compass Observatory |
| Measurements: | Overall: 143 mm; Diameter: 165 mm |
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