This blog attempts to collate various materials in connection with the year 1735.


John Harrison

Constructed between 1730 and 1735, John Harrison's Marine Chronometer number 1 (H1) was essentially a portable version of his precision wooden clocks. It is spring-driven and only runs for one day (the wooden clocks run for 8). The moving parts are controlled and counterbalanced by springs so that, unlike a pendulum clock, H1 is independent of the direction of gravity.
H1 was brought to London in 1735 and displayed to the scientific community. Harrison was beseiged by requests from both scientists and socialites to see the timekeeper.
The following year, Harrison and his timekeeper travelled to Lisbon aboard the ship Centurion to test the clock, and returned on the Orford. H1 performed well in the trial, keeping time accurately enough for Harrison to correct a misreading of the Orford's longitude on the return voyage. However, Harrison did not ask for a second trial but, instead, requested financial assistance from the Board of Longitude to make a second marine timekeeper.

No comments: