Bowl-Black painted brass, filler plug at side, expansion chamber at base incorporated with glazed bottom. Base of bowl fitted with a detachable cover. Inside of bowl painted white with four black lubberlines carried on white painted metal strips attached to underside of verge ring. Verge glass carries a set of mirrored graduations 0-360 degrees engraved on the glass and provision is made for quadrantal corrector magnets at centre of glass, also a location stud for azimuth sight.
Pivot: Pivot stem with pivot cup attached at centre of base of bowl.