Timekeeping, Chronometers, precision watches and timekeepers

The Collection

Your selection

Title

Actions

Buy this image Add this to a collection
Tags
Share or embed this object  

H3

ZAA0036
Timekeeping

Object connections:

Object details:

Object ID ZAA0036
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).
Date made 1757

Artist/Maker Harrison, John
Place made London
Credit National Maritime Museum, Greenwich, London
Materials brass; bronze; steel; glass
Measurements Overall display height: 622 mm
Parts
Help us

Do you know more about this?

Share your knowledge