An eight-day solar/sidereal oak wall mounted regulator by T. Cooke & Sons, York, England, circa 1900.

The weight-driven movement has curved A-frame shaped plates which are united by two screwed square sectioned pillars to the base of the plates and two round screwed pillars with flanges at either end to the top. The majority of the train wheels have six curved crossings but two wheels of a smaller diameter have only four. The mean solar time indication has two trains. The hour and the minute hands are driven by a train of four wheels, the great wheel of which is mounted to the centre arbor. The mean solar seconds indication is driven by a third train comprising of four wheels which convert the output of the escape arbor to mean solar seconds.

The painted square sectioned rectangular weight is suspended from a double line from the narrow barrel (26 turns) which carries the great wheel, Harrison’s maintaining power and is fitted with conventional stop work. The dead beat pallets are mounted to the steel pallet frame by a small brass knurled hand screw and steady pin. The slender polished steel crutch has a capstan screw and slit to facilitate beat adjustment. The pendulum is suspended from a bronze block with a curled surface finish which is screwed to the backboard of the case. The mercury-type temperature compensated pendulum has a steel rod with t-bar above the screw thread which engages with the upper part of the bob which has a regulation scale running around the cap.

The 14 ½ inch black dial has an integral sight ring, outer minute circle with subsidiary sidereal seconds and hour dials with a conventional dial for mean solar time with Roman numerals and hatched minute markings and centre seconds.

The oak case has a circular hood which locks to the glazed trunk by means of an internal swing catch.