LOT 62 Two fusee adjusting rods
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Two fusee adjusting rods, unsigned, probably English, first half of the 19th century The first with clamp incorporating three thumb screws at one end of the steel rod fitted with a set of three brass graduated spherical weights each with thumbscrew for locking onto the shaft, 33cm (13ins) long; the second with clamp employing a single thumbscrew set onto a sliding mount with further thumbscrew for locking onto the shaft further applied with small brass spherical weight incorporating friction spring, 33.5 (13.25ins) long, (2). Fusee adjusting rods are designed to assist in setting the tension of a mainspring to its optimum range to provide equal torque to the wheel train throughout the range of a fusee gear. A description of how such tools were used can be found in Crom, Theodore R. Horological Shop Tools 1700-1900 on pages 474-75.
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Donnington Priory Newbury Berkshire RG14 2JE United Kingdom
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