Pendulum experiments to be conducted at stations of Great Indian Trigonometrical Survey.
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Pendulum experiments to be conducted at stations of Great Indian Trigonometrical Survey.
Plans to confer with [J. T.] Walker and F. A. T. Winnecke from Pulkovo to learn of Russian pendulum experiments before reporting to R.S.L. council. J. H. Pratt's measurement of polar axis and theory about earth's center of gravity.
Pendulum experiments are already approved at principal stations in Russian trigonometrical survey. Recent communication from J. H. Pratt to R.S.L. about pendulum observations.
Writes to introduce JH's son William James and his new bride to the Lyell's. Both JH and his wife, Margaret, are suffering from illness.
About observing a grain-shaped spot on the sun; greetings to Friedrich Winnecke.
Gives reasons for and discusses technicalities of supporting pendulum experiments at astronomical and geodesical stations in Indian trigonometrical survey.
Thanking him for his book [probably Passages in the Life of a Philosopher].
Learned that R.A.S. plans to use aplanatic lenses for solar studies. Submits set of unpublished tables by W. L. Newman [see Newman's 1845-2-18] for calculating radii of such lenses. Refers to work of this kind by Josef Fraunhofer, [G. P.] Bond, K. A. Steinheil, and C. F. Gauss.
Supports, for scientific and commercial reasons, the retention of the British system of measures, arguing against adoption of the metric or decimal system.
No summary available.