An Interesting Mahogany Eight-Day Marine
Chronometer
by Brockbank & Atkins, London No. (1)840, circa 1820
The engraved silvered dial is signed BROCKBANK AND ATKINS LONDON No. 1840 with
Roman chapters and fine gold spade hour and minute hands. Subsidiary dials for up &
down calibrated 1-7 and seconds – both with gold hands.
The movement is signed on the top plate Brockbank’s & Atkins EIGHT DAYS No. 840 London.
With four ring-turned pillars, chain fusee and spring barrel, Earnshaw-type spring detent
escapement ‘wrapped around’ the 4th wheel arbor, jewelled locking stone, unusual three-arm
cut bimetallic balance with three circular heat compensation weights with steel screws, large
balance cock with diamond endstone to free sprung blued steel helical spring, original bowl.
The associated mahogany three-tier box has brass drop handles to the sides, re-
conditioned 19th century bottom and mid sections, later top lid. Modern gimbal and
locking device
SIZE OF BOX: 7in. x 7in. x 7¾in.
PRICE: £3,000
The firm of Brockbank & Atkins were well known makers of fine quality chronometers and
precision clocks working between 1815 and 1835.
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