Datei:John Arnold & Sohn No. 370-671 (4) Werk.jpg

John Arnold & Sohn No. 370-671 Werk.

A late 18th Century English chronometer movement by Arnold in a gilt desk clock with calendar. Full plate gilt keywind fusee movement. Harrison's maintaining power. Pierced and engraved cock with diamond endstone in a blue steel setting, large blue steel hairspring stud. Arnold "O Z" type compensation balance with helical blue steel hairspring. Arnold type spring detent escapement, the detent in a slot in the plate. Screwed in jewelling, escape pivots with endstones. Full restored numbered white enamel dial with subsidiary seconds, Roman numerals, blue steel seconds hand, gold hands. Fitted in a purpose made gilt humpback case in the style of Thomas Cole. Manually set calendar below the dial under a bevelled glass. Silvered cylinder at the left marked with the days of the week changed by a key to align with the date on the silvered rectangular plate. The sides and front of the case decoratively engraved. Plain gilt rear door hinged at its lower edge revealing a hinged frame retained by a latch on the cover to the movement. This is a bayonet fit and easily removed. The hands are set by releasing the latch and lowering the frame. Signed John Arnold & Son - Invt et Fect London - 370/671, Circa 1790, Dimensions 112 x 68 x 50 mm

An interesting use for one of these desirable pocket chronometer movements. The attractive case is of high quality, probably made in the 19th Century. Care has been taken when making it not to alter or damage the movement which still retains its hinge and case latch. See 100 Years of Precision Timekeepers from John Arnold to Arnold and Frodsham by Hans Staeger page 195 and 196 for a similar movement.

Reproduced by kind permission of Pieces of Time - E-Mail: [email protected]

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