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Has just been able to consult Sir William Herschel's papers. Regarding Yvon Villarceau's method of measuring the orbits. May be like his own, which he briefly outlines.
Would like to ask a few more questions regarding JH's method outlined in his last letter. Can UL submit it to the Institute?
Found his letter on return from London. Would be pleased for UL to submit part of his letter of 19 Mar. to the Institute. Further comments on part of this letter.
Has just received JH's letter giving details of an interesting auroral phenomenon. Has been experimenting with wire insulates. Henry Lawson has observed streams of red light resembling aurora.
Tells GA about the internal counterpoise system in use in some German telescope mountings, and includes a diagram; JH knows nothing about chilling speculum metal [see GA's 1849-3-7].
Received news today of JS's arrival in Bombay. Describes conflict as 'Armageddon.' Family news. John Stewart returned from China and leaves soon to meet Matilda [Grahame] in Paris. [Richard] Jones's concern for JS is genuine. Eneas Mackintosh obtained cadetship for JH's son John at Addiscombe.
Asks JH's opinion about GA's plan not to print a separate volume of magnetic and meteorological observations for 1848.
Some concerns about GA's intent of attaching magnetic and meteorological observations to the R.A.S.'s Astronomical Observations [see GA's 1849-3-28].
Will reconsider the proposal about printing observations [see JH's 1849-3-29], and get back to JH.
Sends sample of photographic lenses ground by JJ. Asks JH for formula of curvature to admit more light.
Shall send a catalogue of double stars observed by [W. S.] Jacob. Gives some information about several measurements to establish standards.
About an astronomer for the Madras observatory. Suggests ways to reduce glare and so improve measurements [see RS's 1849-3-4].
Asks GA if he knows of any rules or pitfalls in calculating time from earlier times [even B.C.] to the present.
Has little advice to offer JH about time calculation [see JH's 1849-3-29], except for fairly standard reminders.
Regarding the 'chilled' casting of a telescope.
It is now time that they speak to John Russell (1st Earl Russell) concerning [Francis?] Ronald[s]. Would next Friday suit him?