Marine chronometer

A marine chronometer numbered 48300, by Dent. It has a two-day full-plate fusee movement with four pillars, all fixed with blued screws. It is marked with the broad arrow. The fusee, with stop-work and Harrison's maintaining power, has a pipe round the winding square. The instrument has an Earnshaw-type spring detent escapement and Dent's 'staple-type' compensation balance with a helical balance spring.

The chronometer is mounted in a three-tier mahogany box with a push-catch for the lid and lock for the upper half. The upper half has a strut limiting opening to 90°. On the front of the upper half is screwed a circular tablet inscribed 'DENT / 48300 / TWO DAYS' with a broad arrow. The box fitt...