"The astronomical labours of 1743 would have afforded suflicient occupation to any common man; but notwithstanding all that he did in the observatory, Bradley found time, in this same year, to begin a course of experiments on the length of the seconds' pendulum. ...There are papers also on the same subject in Pound's handwriting, which indicate, that, like other scientific labours, it was pursued by them in common. Their apparatus was similar to that which was used by the earlier French philosophers... the length of the pendulum swinging seconds at that place was found to be between 39,14 and 39,168 inches. ...only valuable as the first approximations by which Bradley's mind became familiarized to the inquiry. ...Bradley found the lengths to be 39,13472 inches at a temperature of 68°, and 39,149 at 32°, which give 39,13710 inches for a temperature of 62°. In this no allowance is made for the resistance of the air..."
James Bradley

January 1, 1970

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