The Royal observatory, Greenwich. A glance at its history and work (1900)
Maunder, E. Walter (Edward Walter), 1851-1928 · London, The Religious tract society · leaf 168
he place in a watch of a pen-dulum in a clock—to the effects of temperature.The British Government, therefore, in 1714 offered a THE TIME DEPARTMENT 165 prize of the amount of ^20,000 for a means of findingthe longitude at sea within half a degree, or, in otherwords, for a watch that would keep… … Harrisons chronometer. regulator to the spring which should push theregulator over in one direction as the temperaturerose, and bring it back as it fell. This he effected byfastening together two strips of brass and steel. Thebrass expanded with heat more rapidly than thesteel, and hence with a…
Royal Greenwich Observatory · Astronomy
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