Thanking him for lecture papers. Has sent his paper on partial differential equations.
Showing 1–20 of 21 items
Thanking him for lecture papers. Has sent his paper on partial differential equations.
Is assisting in communication between G. G. Stokes and GA, about stereoscopic observation of eclipses; JH is not mobile enough to attend the next Board of Visitors meeting.
Response to a letter from JH to G. G. Stokes [1867-5-5] seen by GA, on the problem of the effect of the telescope on illumination from a light source, especially related to a solar eclipse.
Comments on the use of different telescopes and their effect on the albedo of the sun, related to solar eclipses [see JH's 1867-5-5].
A note with G. G. Stokes' letter, which JH forgot to enclose [see JH's 1867-5-5].
Returns JH's letter from G. G. Stokes about eclipse spectroscopy; GA has written to Stokes as well and encloses a copy of this letter.
Regarding earth currents and galvanic registers. Results of recent experiments on these.
Comments on GA's theory of the thermo-electric origin of terrestrial magnetism.
Is very pleased with resolution about the observations of Charles Rümker [see Edward Sabine's 1867-8-30].
It appears that the Indian government has now approved the introduction of the metric system; JH is very upset.
Thanking him for his paper on Indian Standards and systems of measurement.
Regarding the theory of magnetic currents.
Expresses GA's contempt for those who legislate for others without knowing what they are doing; GA is talking about the Indian legislation [see JH's 1867-9-12].
Writes to inquire as to the exact definition of the gallon and the pound, and the circumstances under which the appropriate measures would be made.
Provides JH with best definition that GA has available for the gallon [see JH's 1867-11-3], noting that methods for establishing standards are revised, even if the standards supposedly are not.
Concerned about 'Commercial weight' of new standard of weights and measures.
Writes to acknowledge receipt of letter [see JH's 1864-11-25], but it will take time to work through JH's calculations carefully.
Is still trying to bring the various definitions of the pound into agreement [see GA's 1867-11-30]; the question of weighing in air or vacuum remains as a problem.
Thanks JH for his useful letter [see JH's 1867-12-2]; it will be of value to the Commission on Weights and Measures.
Having helped to create confusion surrounding the pound weight [see GA's 1867-12-3], JH now understands it simply and clearly; JH wonders if he is 'growing elderly.'