The Arnfield clock has justifiably earned a place in Meccano literature, and many examples have already been built. It has attracted considerable attention in the horological world as well. The special feature of this clock is the detached gravity escapement, where the pendulum is left almost free, the unlocking being carried out by the gravity arm, and not the pendulum itself. The action of the escapement is fascinating and visually attractive.
These instructions describe the construction of a redesign of the clock described in MP 104. While keeping to the original principle it now has a completely rebuilt escapement which consumes very much less power, and the clock has an epicyclic planetary weight rewound by an electric motor powered by a simple torch battery and runs for months unattended. There is a large seconds hand and a greatly simplified pendulum which follows horological principles closely.
A 16 page booklet describes the Principles of Operation, Assembly of Clock Plates, Going Train, Motion Work, Escape Wheel & Jig; Planetary Motor & Motor Control; Escapement-Impulse Arm, Lifting Lever, Locking Arm and Adjustment; The Pendulum:-Suspension Spring, Pendulum Bearer, & Bob and Operation; Clock Case, Faces, and Timing. It is illustrated with nine colour photographs and includes a parts list, sixteen drawings in a separate 8 page booklet and two printed clock faces to cut out.
Please note these Model Plans are designed by individual Meccano modellers and may use parts not currently available. The level of instruction detail is dependent on the original modeller and varies from plan to plan. These are instructions only.
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