The Harrison regulator is unlike any other clock I have made. Compared with a conventional regulator it is massive and the construction unorthodox.
The main plates act as a support structure using conventional pillars. The arbors do not run in the plates but are carried on two anti-friction wheels at each end, supported by bridges mounted on the plates. The exception is the main winding arbor, which running on Harrison’s original and innovative roller bearings, are made from bell bronze [80% copper +20% tin] and mounted in the plates.
The pillar and plate profiles closely replicate the original clock. Traditional methods of cutting and filing were employed on the plates with a wide use of a hand graver when turning pillar profiles.
A suspension bar, in the base of the mechanism for supporting the drive weight, is supported by two Etruscan order pillars, one at each end.
The six main pillars will eventually be rivetted to the rear plate. However, while building the clock, temporary screwed stubs are substituted to simplify the many times the clock will be assembled and disassembled during the building process.
The dial is made up of two sections which are mounted on pillars with conventional taper pin locking.
Main plates are cut from 3/16 inch sheet, and bridges are made from 1/8 inch sheet.