|
Date: |
|
Description: | 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).
AQN: Royal Greenwich Observatory (lender). ZAA0036 John Harrison's third marine timekeeper has four parts associated with it, numbered .1 - .4. To view these part records, use the toggle next to the Whole/Part field on page one.
caption: H1 - Front View
caption: Harrison's Marine Chronometer number 3 (H3) - 3/4 front view
caption: Marine timekeeper (H3), front
caption: Harrison's Marine Chronometer number 3 (H3) - view of front
caption: Harrison's Marine Chronometer number 3 (H3) - 7/8 front view
caption: Marine timekeeper (H3) with case
caption: unavailable
caption: Marine timekeeper (H3), back and side
caption: Marine timekeeper
caption: H3 - Cutout image of D6785-5
caption: H1 - 3/4 Raised Front
caption: H1 - Compensation Assembly
caption: H1 - Dial
caption: H1 - Train - General View From Front
caption: H1 - Train - Detail View
caption: H1 - Remontoire, Balance, Ribbons & Escapement
caption: H1 - Compensation
caption: H1 - Compensation Detail
caption: H1 - Side View From Left
caption: H1 - Fusee & Remontoire
caption: H1 - Rear View
caption: H1 - Rear Bearing Of Isochroniser
caption: H1 - Rear Side View
caption: H1 - Fusee & Chain Barrell
caption: H1 - Balance Springs & Bimetal
caption: H1 - Upper Escapement Pallett Raised View
caption: H1 - Upper Escapement Pallett Lower View
caption: H1 - Glazed Case Front
caption: H1 - Glazed Case 3/4 Raised
caption: H1 - Glazed Case Side View
caption: H1 - Glazed Case Rear View
caption: H1 - Glazed Case Joint Detail
caption: H1 - Glazed Case Joint & Edge Detail
caption: H1 - Glazed Case Top Corner Detail | Publisher: | "http://collections.rmg.co.uk/" | Rights holder: | "Royal Museums Greenwich" | Subjects: | Horology Royal Greenwich Observatory The Old Royal Observatory Greenwich Treasures of the National Maritime Museum Collections Blog | Source: | Royal Museums Greenwich | Identifier: | http://collections.rmg.co.uk/collections... | Go to resource |
|
More Like this...
-
H2
Marine timekeeper, H2. Made between…
-
H1
Marine timekeeper, H1. This is…
-
H4
John Harrison \&\ Son AD…
-
K1
A one day marine timekeeper…
-
4070
Marine chronometer numbered 4070, by…
-
K2
Larcum Kendall. 1771 London
ORIGINAL…
-
K3
A one day marine timekeeper…
-
-
Movement
Movement for ZAA0037 John Harrison's…
-
|