About William Whewell's accident, and the ideas of E. F. W. Klinkerfüss on the behavior of light due to the motion of a star source.
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About William Whewell's accident, and the ideas of E. F. W. Klinkerfüss on the behavior of light due to the motion of a star source.
Comments on the quality of the star catalogue of Charles Rümker [see John Wrottesley's 1866-4-16].
Comments on William Whewell's replacement on the Royal Observatory's Board of Visitors.
Inquires of GA as to the current status of parliamentary moves to introduce the metric system into Britain [see GA's 1864-9-28].
Has heard that the Indian government may adopt the metric system; wants to gather, and send to India, information against metrication; JH still wants to bring the earth's axis length into the measuring system.
Avails himself of GA's offer of assistance to obtain information [see GA's 1866-4-27].
Comments on Charles Rümker's observations and agrees to a meeting [see John Wrottesley's 1866-5-12].
Responds to meeting arrangements [see GA's 1866-5-24].
Not well enough to attend Visitation Day at the Royal Observatory, but would be pleased if GA would invite JH's son John.
A note to accompany forwarding of papers and letters relating to Charles Rümker's observations [see GA's 1866-5-31].
Has been asked to serve on a new Commission on Weights and Measures; indications are that the metric system is being recommended to the Indian government.
JH responds with an assessment of the Indian observatories [see GA's 1866-9-24].
Comments on the work of the Commission on Weights and Measures as outlined by GA [see GA's 1866-9-13].