Responds to JB's 1832-8-25 with comments about the optical properties of tourmaline. JH also talks about his astronomical work, including the collimator on his telescope and his double star work.
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Responds to JB's 1832-8-25 with comments about the optical properties of tourmaline. JH also talks about his astronomical work, including the collimator on his telescope and his double star work.
Not willing to be involved in translation of French work on astronomy [see JB's 1867-2].
Notes ingenuity of JB's gravimetric balance. Astonished that it did not occur to anyone before. [Letter continues 5 Feb.:] Suggestion for improving torsion thread arrangement.
JB's solution to torsion thread arrangement is simpler and more ingenious than JH's. Enquires about details of gravimetric balance. Pendulum measurements. Density of continents. Clarification of JH's privileges as foreign associate of Institute. Death of J. B. Biot.
Suggestions on improving JB's gravimetric balance, constructed on principle of 'Bifilar suspension.' Refers to 1861 report of similar invention by J. A. Brown and another article on this topic.
No mention of Emmanuel Liais's L'espace céleste in English journals. Contact London publishers to find translator for it. Alexander Herschel is now professor of natural philosophy at Andersonian Institution in Glasgow. Hopes JB's elegant method of measuring gravity by torsion will not die before being put into practice.