Not aware of any experiments to ascertain the amount of personal error in the estimate of time of a star transit. JH then comments on monetary matters including the value and gold equivalence of sovereigns issued by the Mint.
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Not aware of any experiments to ascertain the amount of personal error in the estimate of time of a star transit. JH then comments on monetary matters including the value and gold equivalence of sovereigns issued by the Mint.
Thanks WJ for his papers on clouds [see WJ's 1861-7-21]. JH had not seen these, but praises their contents.
Acknowledges receipt of WJ's treatise on logic, and comments on it.
Is grateful for his valuable work on the Coal question. Such a work has been long wanted. Used to have a theory himself that the tides might be utilized, but working it out found it was not economic.
Agrees to WJ's request to make use of an earlier letter of JH's [see WJ's 1866-3-7].
Many thanks for the Preface to the second edition of WJ's pamphlet, and for the extract on tides. Comments on this and the use of tidal power. Was disappointed at not being able to visit Manchester but suffered a severe fall.
Expresses concern that the present rate of use of natural resources and the increase in population may create serious problems in the future.
[Responding to WJ's 1870-10-29], JH declines participating, suggesting that too many lobbying groups already exist and that such groups frequently end up agitating for ends others than those that led to their creation.
Is unaware of experiment measuring amount of absolute error in transit measurements. Discusses matters relating to coinage and the standards underlying it.