No. 7.—G. B. Airy to Professor Challis.
[Extract.]
“‘Royal Observatory, Greenwich, 1844, Feb. 15.
“‘I send all the results of the observations of Uranus made with both instruments (that is, the heliocentric errors of Uranus in longitude and latitude from 1754 to 1830, for all those days on which there were observations, both of right ascension and of polar distance). No alteration is made in Bouvard’s Tables of Uranus except in increasing the two equations which depend on Jupiter by 1⁄50 part. As constants have been added (in the printed tables) to make the equations positive, and as 1⁄50 part of the numbers in the tables has been added, 1⁄50 part of the constants has been subtracted from the final results.’
“Professor Challis in acknowledging the receipt of these, used the following expressions:—
No. 8.—Professor Challis to G. B. Airy.
[Extract.]
“‘Cambridge Observatory, Feb. 16, 1844.
“‘I am exceedingly obliged by your sending so complete a series of tabular errors of Uranus.... The list you have sent will give Mr. Adams the means of carrying on in the most effective manner the inquiry in which he is engaged.’
“The next letter shows that Mr. Adams has derived results from these errors.
No. 9.—Professor Challis to G. B. Airy.
“‘Cambridge Observatory, Sept. 22, 1845.