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1860-1869::1864::06 in date 
Herschel, John in author 
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Herschel14594

From:
Sir John Herschel
To:
[Edward Sabine?]
Date:
[1864-6]
Source of text:
TxU:H/M-0579.2; Reel 1093
Summary:

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.

Contributor:
John Herschel Project

Herschel1501

From:
Sir John Herschel
To:
Sir Charles Lyell
Date:
[2 June 1864]
Source of text:
APS B.D25.L.5
Summary:

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.

Contributor:
John Herschel Project

Herschel180

From:
Sir John Herschel
To:
George Biddell Airy
Date:
[3 June 1864]
Source of text:
RGO 6.255.44
Summary:

About observing a grain-shaped spot on the sun; greetings to Friedrich Winnecke.

Contributor:
John Herschel Project

Herschel5387

From:
Sir John Herschel
To:
Charles Babbage
Date:
[5 June 1864]
Source of text:
RS:HS 2.334
Summary:

Thanking him for his book [probably Passages in the Life of a Philosopher].

Contributor:
John Herschel Project

Herschel12948

From:
Sir John Herschel
To:
Edward Sabine
Date:
[1864-6-9 or later]
Source of text:
TxU:H/L-0360.1; Reel 1054
Summary:

Pendulum experiments to be conducted at stations of Great Indian Trigonometrical Survey.

Contributor:
John Herschel Project

Herschel12963

From:
Sir John Herschel
To:
Edward Sabine
Date:
[11 June 1864]
Source of text:
TxU:H/L-0376; Reel 1054 (C: RS:HS 24.47)
Summary:

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.

Contributor:
John Herschel Project

Herschel3393

From:
Sir John Herschel
To:
Edward Sabine
Date:
[16 June 1864]
Source of text:
RS MC.7.99
Summary:

Gives reasons for and discusses technicalities of supporting pendulum experiments at astronomical and geodesical stations in Indian trigonometrical survey.

Contributor:
John Herschel Project

Tyndall2111

From:
John Herschel
To:
John Tyndall
Date:
June 18 1864
Source of text:
HS 393b; MS JT/1/H/101; MS JT/1/TYP/2/524-7, RS; RI
Summary:

No summary available.

Contributor:
Tyndall Project

Herschel880

From:
Sir John Herschel
To:
the London Times
Date:
[18 June 1864]
Source of text:
JHS 5.1
Summary:

Supports, for scientific and commercial reasons, the retention of the British system of measures, arguing against adoption of the metric or decimal system.

Contributor:
John Herschel Project

Herschel7782

From:
Sir John Herschel
To:
the R.A.S.
Date:
[29 June 1864]
Source of text:
RAS: MSS Add.29 [suppl.]
Summary:

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.

Contributor:
John Herschel Project
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