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An image showing 'H1 - Front View'
An image showing 'Harrison's Marine Chronometer number 3 (H3) - 3/4 front view'
An image showing 'Marine timekeeper (H3), front'
An image showing 'Harrison's Marine Chronometer number 3 (H3) - view of front'
An image showing 'Harrison's Marine Chronometer number 3 (H3) - 7/8 front view'
An image showing 'Marine timekeeper (H3) with case'
An image showing ''
An image showing 'Marine timekeeper (H3), back and side'
An image showing 'Marine timekeeper'
An image showing 'H3 - Cutout image of D6785-5'
An image showing ''
An image showing ''
An image showing ''
An image showing ''
An image showing ''
An image showing 'H1 - 3/4 Raised Front'
An image showing 'H1 - Compensation Assembly'
An image showing 'H1 - Dial'
An image showing 'H1 - Train - General View From Front'
An image showing 'H1 - Train - Detail View'
An image showing 'H1 - Remontoire, Balance, Ribbons & Escapement'
An image showing 'H1 - Compensation'
An image showing 'H1 - Compensation Detail'
An image showing 'H1 - Side View From Left'
An image showing 'H1 - Fusee & Remontoire'
An image showing 'H1 - Rear View'
An image showing 'H1 - Rear Bearing Of Isochroniser'
An image showing 'H1 - Rear Side View'
An image showing 'H1 - Fusee & Chain Barrell'
An image showing 'H1 - Balance Springs & Bimetal'
An image showing 'H1 - Upper Escapement Pallett Raised View'
An image showing 'H1 - Upper Escapement Pallett Lower View'
An image showing 'H1 - Glazed Case Front'
An image showing 'H1 - Glazed Case 3/4 Raised'
An image showing 'H1 - Glazed Case Side View'
An image showing 'H1 - Glazed Case Rear View'
An image showing 'H1 - Glazed Case Joint Detail'
An image showing 'H1 - Glazed Case Joint & Edge Detail'
An image showing 'H1 - Glazed Case Top Corner Detail'
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H3

Marine timekeeper, H3. Started in 1740, this third timekeeper took Harrison nearly 19 years to build and adjust, although it was not to win him the great longitude prize: he found that he just could not persuade the two large, heavy, circular balances to keep time well enough. Nevertheless, H3 incorporates two extremely important inventions, both relevant today: the bimetallic strip (still in use worldwide in thermostats of all kinds) and the caged roller bearing, a device found in nearly all modern mechanical engineering. See also; ZAA0034 (H1), ZAA0035 (H2) and ZAA0037 (H4).
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Object details

ID: ZAA0036
Collection: Timekeeping
Type: Marine timekeeper
Display location: Display - ROG
Creator: Harrison, John
Places: Greenwich
Date made: 1759
Exhibition: Time and Longitude; Ships, Clocks & Stars: The Quest for Longitude
People: Royal Greenwich Observatory
Credit: National Maritime Museum, Greenwich, London
Measurements: Overall display height: 622 mm
Parts: H3