JH must write official letter to Admiralty stating completion of [Cape of Good Hope] telescope and explaining reason for additional £170.
JH must write official letter to Admiralty stating completion of [Cape of Good Hope] telescope and explaining reason for additional £170.
Regarding spots on the sun and [T. J.?] Hussey and [A.?] Dawson's observations.
No summary available.
JH comments on quality of Georg Merz object glasses.
Gratitude for receipt of JH's Cape Results. Owning no instruments, EH appreciated JH's chapter on 'naked eye' astronomy. Notes and drawings of variable stars.
No summary available.
Agrees that some of JH's suggestions about meteor showers were probably unnecessary [see GA's 1848-1-29].
Is aware of T. J. Hussey's drawings [see GA's 1848-2-1]; needs information about P. A. Hansen's lunar theory for an appreciation JH is to provide.
Concerning P. A. Hansen's observations of Lunar irregularities.
Some additional details about JH's aunt Caroline [see JH's 1848-1-27].
JH must arrange for the celebration of Bishop's Observatory. Needs information on its equipment, achievements, and staff, e.g., on W. R. Dawes's and J. R. Hind's observations. Will contact Hind.
Has found that Orionus is a double star. Compares William Lassell's and Wilhelm Struve's observations of various stars.
Sending something from Airy relating to the testimonial. Anything he does not use can be returned to Somerset House for AD.
No summary available.
As JH has accepted the superintendency of the Admiralty Manual he will try to undertake the geological part, but it will take time as he is busy on another project.
Undertakes to write geological part of Admiralty Instructions [A manual of scientific enquiry (1849), Collected papers 1: 227–50]. Has doubts as to his success.
Has been invited to contribute geological instructions [to J. F. W. Herschel, ed., Manual of scientific enquiry (1849); Collected papers 1: 227–50]. Asks RO whether remarks on coral reefs appertain to geology rather than zoology.
Looks forward to visit by Owens.
Invites him to dinner on Saturday the 12th. Charles and Mrs Lyell, Edward Forbes, Richard Owen, and Thomas Bell coming also.
"Will you bring your map of S. America … and we will have a talk over it."
Has performed experiments measuring the deviation of spectra through an obliquely placed diffraction grating. Believes they strongly support the wave theory of light.
Received yesterday JH's receipts for payment of Cape telescope. Forwarded these to accountant general of Navy.