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Pritchard, Charles in correspondent 
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From:
Charles Pritchard
To:
Sir John Herschel
Date:
n.d.
Source of text:
RS:HS 14. 111
Summary:

Experiments with lens curvature and prisms. Wants to discover set rules for lens thickness-to-curvature ratio.

Contributor:
John Herschel Project
From:
Charles Pritchard
To:
Sir John Herschel
Date:
[1844]
Source of text:
RS:HS 14.107
Summary:

JH to visit CP's house. CP suggests they both visit J. P. Gassiot, where they might also meet with Michael Faraday. Asks JH if there are experiments he would like to see during visit. Reports observing Fraunhofer lines through a prism.

Contributor:
John Herschel Project
From:
Charles Pritchard
To:
Sir John Herschel
Date:
[11 November 1845]
Source of text:
RAS:JH Archive 4/9.50 verso; Reel 7
Summary:

Looking forward to visit to Collingwood.

Contributor:
John Herschel Project
From:
Charles Pritchard
To:
Sir John Herschel
Date:
[1846?]
Source of text:
RS:HS 14.108
Summary:

Congratulates JH and Margaret Herschel on birth of a daughter [Francisca?]. Asks JH's opinion of the ideas of 'lines of force' and 'lateral shakes.' Conducts a force experiment with J. P. Gassiot.

Contributor:
John Herschel Project
From:
Charles Pritchard
To:
Sir John Herschel
Date:
8 July [1848]
Source of text:
unknown
Summary:

Receives object glass from Munich for double star observations.

Contributor:
John Herschel Project
From:
Charles Pritchard
To:
Sir John Herschel
Date:
[15 July 1855]
Source of text:
RS:HS 14.78
Summary:

Visits Angelo Secchi at Rome observatory, where they are comparing information in Cape Results to their observations.

Contributor:
John Herschel Project
From:
Charles Pritchard
To:
Sir John Herschel
Date:
[27 November 1859]
Source of text:
JHS 5.28
Summary:

Writes to JH to propose hiring JH's son Alexander for a year to work in CP's laboratory and make observations in CP's observatory.

Contributor:
John Herschel Project
From:
Charles Pritchard
To:
Sir John Herschel
Date:
[15 December 1859]
Source of text:
RS:HS 14.79
Summary:

Searches for asteroids. Measures double stars and variables; Alexander Herschel assists. Asks JH's opinion of parallax measuring methods. R.S.L. funds offered to M. J. Johnson's family in his memory.

Contributor:
John Herschel Project
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
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
From:
Charles Pritchard
To:
Sir John Herschel
Date:
31 July [1860?]
Source of text:
RS:HS 14.110
Summary:

Problems making actinometer observations during solar eclipse. Reports he did not observe the supposed planet Vulcan, but a fixed star. Sends micrometer observations. Describes shape of prominences.

Contributor:
John Herschel Project
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
From:
Charles Pritchard
To:
Sir John Herschel
Date:
[19 October 1863]
Source of text:
RS:HS 14.83 Ada Pritchard, Charles Pritchard: Memoirs of His Life, 240-1
Summary:

Warren de La Rue observes 'willow leaves' [mottling on solar surface]. Diagonal solar eyepiece works with great success. Praises de La Rue's work as having astounding accuracy.

Contributor:
John Herschel Project
From:
Charles Pritchard
To:
Sir John Herschel
Date:
[15 December 1863]
Source of text:
RS:HS 14.84
Summary:

Describes debate at R.A.S. over the nature of the 'willow leaves.' Different parties argue that the 'leaves' are solid, precipitate, or non-luminous gas.

Contributor:
John Herschel Project
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
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
From:
Charles Pritchard
To:
Sir John Herschel
Date:
[24 January 1864]
Source of text:
RS:HS 14.86
Summary:

Asks JH for information on the Beaufoy Clock owned by R.A.S., which is now missing. Requests JH to read R.A.S. Annual Report.

Contributor:
John Herschel Project
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
From:
Charles Pritchard
To:
Sir John Herschel
Date:
[20 February 1864]
Source of text:
RS:HS 14.88
Summary:

Richard Hodgson claims to have invented the diagonal solar eyepiece despite JH's description of it in Cape Results.

Contributor:
John Herschel Project
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