Waterwheel ball bearing clock by Peter Bonnert
Waterwheel ball bearing clock by Peter Bonnert
Waterwheel ball bearing clock by Peter Bonnert
Waterwheel ball bearing clock by Peter Bonnert
Waterwheel ball bearing clock by Peter Bonnert
Waterwheel ball bearing clock by Peter Bonnert

Waterwheel ball bearing clock by Peter Bonnert

c. 1971 England

Offered by Carlton Clocks Ltd.

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An English constant force waterwheel timepiece, signed Peter Bonnert, Maidstone No 103 and dated c.1971, the gilding on the brass frame all in excellent original condition.

The large wheel has 60 compartments at its rim to receive the ball bearings fed every minute from above by a vertical conveyer belt. 30 seconds later, a ball bearing is subsequently released a third of the way round the wheel into a channel, and fed back to the scoops at the bottom of the conveyor belt via a zig-zag run.

The waterwheel is faced with a 7¼ inch transparent circular dial plate with open centre and engraved Roman numerals, and blued steel fleur-de-lys hands.

The gilded clock fame is mounted on a figured walnut plinth with the winding hole to front, and encased by a brass-bound glass cover.

The high quality eight day six pillar movement has pierced tapered plates, a three wheel train with six-spoke wheel crossings and deadbeat escapement.

The motion of the conveyor belt is governed by trip release mechanism behind the 'waterwheel',and it is driven by a separate four pillar single fusee movement with dual spring barrels housed in the base.
Overhauled and guaranteed for 3 years
Peter Bonnert is a highly respected contemporary horologist who became a fellow of the British Horological Institute in 1968 and was awarded 'The Master's Medal' by the Worshipful Company of Clockmakers' for his exemplary services to horology in 2010.

Bonnert's waterwheel is based upon a design illustrated in Tardy's p.92, dating the design to the 1880s. It was also exhibited at the 'Exposition Universelle' of 1900 which was illustrated by Planchon in La Revue Chronometrique published in October of that year - see the link below.
It has also been copied by Far East manufacturers, although these are of a considerably lesser quality.
Dimensions
Height 50.00 cm (19.69 inches)
Width 49.00 cm (19.29 inches)
Depth 26.00 cm (10.24 inches)
Signed/Inscribed
c.1971
Carlton Clocks Ltd.

Carlton Clocks Ltd.
Chalfont Station Road
Little Chalfont
Buckinghamshire
HP7 9PN

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