Search: Herschel, John in correspondent 
Pritchard, Charles in correspondent 
letter in document-type 
1860-1869 in date 
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Herschel4538

From:
Charles Pritchard
To:
Sir John Herschel
Date:
[9 November 1864]
Source of text:
RS:HS 14.92
Summary:

Compares W. L. Newman's and CP's calculations of optical coefficients to those in JH's work. Sends JH formulae and tables for calculating telescopic lens thickness and shape in relation to the dimensions of the telescope. Wishes JH luck on Iliad.

Contributor:
John Herschel Project

Herschel4540

From:
Charles Pritchard
To:
Sir John Herschel
Date:
[23 June 1860]
Source of text:
RS:HS 14.80
Summary:

Asks JH's opinion on CP's eclipse observations plans, especially on which equipment to use. Intends to use a 'diagonal solar eyepiece' during the eclipse. Plans to observe carefully and to sketch solar flares.

Contributor:
John Herschel Project

Herschel4541

From:
Charles Pritchard
To:
Sir John Herschel
Date:
[28 July 1860]
Source of text:
RS:HS 14.81
Summary:

Sends observations of eclipse; asks JH to check accuracy. Details observations with diagonal solar eyepiece. Describes solar corona and lists bright stars visible during totality.

Contributor:
John Herschel Project

Herschel4542

From:
Charles Pritchard
To:
Sir John Herschel
Date:
[10 June 1861]
Source of text:
RS:HS 14.82
Summary:

Observes and measures sunspots. Takes spectrum of solar photosphere; detects sodium and magnesium absorption lines. Pleased with Alexander Herschel's work on the solar spectrum; wishes he would begin work on stellar spectra.

Contributor:
John Herschel Project

Herschel4543

From:
Charles Pritchard
To:
Sir John Herschel
Date:
[16 January 1864]
Source of text:
RS:HS 14.85
Summary:

Thanks JH for solar observations. Discusses 'willow leaves' observations made at Greenwich Observatory after following JH's suggestions for solar eyepiece.

Contributor:
John Herschel Project

Herschel4544

From:
Charles Pritchard
To:
Sir John Herschel
Date:
[8 February 1864]
Source of text:
RS:HS 14.87
Summary:

Thanks JH for reading R.A.S. records. G. P. Bond will not receive R.A.S. medal. The Beaufoy Clock is recovered.

Contributor:
John Herschel Project

Herschel4545

From:
Charles Pritchard
To:
Sir John Herschel
Date:
[21 February 1864]
Source of text:
RS:HS 14.89
Summary:

Richard Hodgson pursues claim to invention of the diagonal solar eyepiece while claiming that JH disclaimed the invention.

Contributor:
John Herschel Project

Herschel4546

From:
Charles Pritchard
To:
Sir John Herschel
Date:
[10 November 1864]
Source of text:
RS:HS 14.93
Summary:

Compares JH's equation for lens curvature with that of C. F. Gauss.

Contributor:
John Herschel Project

Herschel4548

From:
Charles Pritchard
To:
Sir John Herschel
Date:
[27 March 1867]
Source of text:
RS:HS 14.102
Summary:

Asks if JH still considering editing William Herschel's R.S.P.T. publications. Suggests that Alexander Herschel edit the work. Speculates that William Herschel observed the 'willow leaves.' JH's star catalogue will be printed by the R.A.S.

Contributor:
John Herschel Project

Herschel7765

From:
Charles Pritchard
To:
Sir John Herschel
Date:
[20 January 1864]
Source of text:
RAS:JH Archive 15/5.2; Reel 11
Summary:

Gratitude for JH's gift of Caroline Herschel's autograph manuscripts to R.A.S.

Contributor:
John Herschel Project
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