Finds GA's measurements of Gamma Virginis far away from JH's own, and instructs GA in the best way to measure double star positions.
Showing 101–120 of 425 items
Finds GA's measurements of Gamma Virginis far away from JH's own, and instructs GA in the best way to measure double star positions.
Has received a request from the Admiralty to order a new telescope for the Cape observatory; at the same time, JH has received an unsolicited offer of a lens. JH seeks advice and information from GA.
Regarding custody of the Standards.
Makes some suggestions about possible storage places for the United States' standards [see GA's 1843-9-9].
Gives formula for defining the measure of the scale of an actinometer.
Recommends buying optics for 7.5-inch telescope from Metz and Mahlers in Munich and having those mounted in London.
Urges doubling number of lunar observations.
Would support improvements, both in number and quality, of lunar observations at the Royal Observatory; current practices produce unacceptably large predictive errors.
Will try to attend meeting called by GA, although JH is plagued by rheumatism; comments on the periods of Saturn's satellites.
Has not heard from Thomas Maclear [see GA's 1844-3-12]; has the Cape equatorial object glass been dealt with?
Comments on the large number of stars identified in one square degree of sky.
Whether a repulsive force from the sun affects the tails of comets and thus the constancy of their orbits.
Arrangements about attending a meeting, together with some thoughts on the behavior of comets.
Regarding object glasses for telescopes. Relative merits of Munich and French object glasses.
Will try to organize an international magnetic conference at the B.A.A.S. meeting in 1845, if GA agrees.
About a suggested magnetism conference, Francis Baily's illness, and some remarkable observations by F. W. Bessel.
Urges GA to print any of John Pond's and Nevil Maskelyne's observations that seem free from serious error [see GA's 1844-8-28].
Has been put (with GA and W. S. Stratford) on a B.A.A.S. committee to publish the J. J. L. Lalande and the N. L. Lacaille star catalogues [see GA's 1842-11-7]; sends draft request for a grant.
Nine conditions under which JH will accept and test instruments constructed for Cape [of Good Hope] observatory, including the assistance of Mr. Davies in evaluating these.
Seeks GA's help to provide information to complete the obituary notice for Francis Baily [see GA's 1844-9-23].