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de La Rue, Warren in correspondent 
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From:
Warren de La Rue
To:
Sir John Herschel
Date:
[26 June 1861]
Source of text:
RS:HS 6.148
Summary:

Gives diameter of the sun's image. Used an ordinary eye-piece. There must be some mistake about the penumbra. It is possible now to take daily records of the surface of the sun.

Contributor:
John Herschel Project
From:
Warren de La Rue
To:
Sir John Herschel
Date:
[24 August 1861]
Source of text:
RS:HS 6.147
Summary:

Sending him his first photograph of the sun's spot. Has caused a lot of preparation. Comments on various points.

Contributor:
John Herschel Project
From:
Sir John Herschel
To:
Warren de La Rue
Date:
[7 November 1861]
Source of text:
RS:HS 23.346
Summary:

Thanks for pictures of Mars; speculates on the atmospheres of some planets.

Contributor:
John Herschel Project
From:
Warren de La Rue
To:
Sir John Herschel
Date:
[10 November 1861]
Source of text:
RS:HS 6.149
Summary:

Is pleased that JH likes his plates of Mars. Has a great collection of drawings of Mars but only a few of Venus. Hopes by the Spring to have the photoheliograph working. Has just completed his volume on the eclipse for 1860.

Contributor:
John Herschel Project
From:
Sir John Herschel
To:
Warren de La Rue
Date:
[28 February 1862]
Source of text:
RS:HS 23.364
Summary:

Thanks for fine engravings; is concerned about the 'miraculous phenomena' depicted on some other people's engravings, 'especially American ones.'

Contributor:
John Herschel Project
From:
Warren de La Rue
To:
Sir John Herschel
Date:
[14 September 1862]
Source of text:
RS:HS 6.150
Summary:

Regarding the pictures of the moon by M. M. Gussew. Gives details of the eclipse of 1860. Heliograph has been working at his observatory since February. G. Sabler has now left and will doubtless do good work when he receives his instrument from J. H. Dallmeyer.

Contributor:
John Herschel Project
From:
Warren de La Rue
To:
Sir John Herschel
Date:
[23 November 1863]
Source of text:
RS:HS 6.152
Summary:

Thinks it possible that a letter he wrote to Charles Pritchard may have been passed to JH. Thinks there is some substance in James Nasmyth's claim on seeing 'Willow leaves' on the surface of the sun.

Contributor:
John Herschel Project
From:
Warren de La Rue
To:
Sir John Herschel
Date:
[1 May 1864]
Source of text:
RS:HS 6.153
Summary:

Regarding the solar photographs. They are not magnified originals but taken direct. Comments on these photographs. Has had correspondence with W. R. Dawes regarding the 'willow leaves' of James Nasmyth.

Contributor:
John Herschel Project
From:
Warren de La Rue
To:
Sir John Herschel
Date:
[1 June 1864]
Source of text:
RS:HS 6.154
Summary:

Agrees with him that J. Müller's drawings do not show the entities around the sunspot clearly. Has nearly completed the apparatus for holding one of JH's sun prisms to his reflector. Hopes to do something with it soon.

Contributor:
John Herschel Project
From:
Warren de La Rue
To:
Sir John Herschel
Date:
[3 July 1864]
Source of text:
RS:HS 6.155
Summary:

Appreciates the difference between Robert Hooke's and JH's suggestions for a helioscopic telescope. Comments on these suggestions. Has recently constructed a reflecting prism. Comments on this.

Contributor:
John Herschel Project
From:
Warren de La Rue
To:
Sir John Herschel
Date:
[11 July 1864]
Source of text:
RS:HS 6.156
Summary:

Was not the person who sent him some photographs of the sun. Was glad the Astronomical Soiree was well spoken of. James Nasmyth was conspicuous and is pleased he was mentioned in JH's Outlines Astr.

Contributor:
John Herschel Project
From:
Warren de La Rue
To:
Sir John Herschel
Date:
[18 July 1864]
Source of text:
RS:HS 6.157
Summary:

Encloses a letter from William Simms, which contains a suggestion for JH's reflecting prism. Inclines to the view that a reflector is not the most suitable instrument for sun observations.

Contributor:
John Herschel Project
From:
Warren de La Rue
To:
Sir John Herschel
Date:
[20 July 1864]
Source of text:
RS:HS 6.158
Summary:

Sending the tracing again with a few additions. Comments on this and the one sent yesterday.

Contributor:
John Herschel Project
From:
Warren de La Rue
To:
Sir John Herschel
Date:
[6 August 1864]
Source of text:
RS:HS 6.159
Summary:

Sending a photograph of the moon 38" in diameter. Begs him to accept it as a mark of appreciation.

Contributor:
John Herschel Project
From:
Warren de La Rue
To:
Sir John Herschel
Date:
[24 September 1864]
Source of text:
RS:HS 6.160
Summary:

Has just returned from a short tour of Russia. Visited Pulkowa and Nijny Novgorod. Had difficulties with couriers. JH's suggestion for a rotating disc with slit to reduce sunlight sounds feasible. Weather was unsuitable at Pulkowa for any observations.

Contributor:
John Herschel Project
From:
Warren de La Rue
To:
Sir John Herschel
Date:
[25 October 1864]
Source of text:
RS:HS 6.161
Summary:

Has just received JH's 'Catalogue of Nebulae.' Has placed his skeleton tube in the cradle of his equatorial. Comments on this and gives sketches.

Contributor:
John Herschel Project
From:
Warren de La Rue
To:
Sir John Herschel
Date:
[22 November 1864]
Source of text:
RS:HS 6.162
Summary:

Encloses a letter from Angelo Secchi. Sent him a Herschelian eye piece and is having a prism prepared for him. Secchi has seen James Nasmyth's 'willow leaves.'

Contributor:
John Herschel Project
From:
Sir John Herschel
To:
Warren de La Rue
Date:
[4 December 1864]
Source of text:
RS:HS 6.163 & 24.73
Summary:

Thanks for the diary and pocket book. Sees that A. V. Guillemin has published an illustrated Astronomy [Le ciel (Paris, 1864)]. Thinks there is scope for publishing a volume of engravings of astronomical objects. Gives his own idea for the construction of a photometer.

Contributor:
John Herschel Project
From:
Warren de La Rue
To:
Sir John Herschel
Date:
[12 December 1864]
Source of text:
RS:HS 6.164
Summary:

Has received a letter from Angelo Secchi who states that he has seen James Nasmyth's 'willow leaves.' Remainder of letter relates to the JH prism, which he sent him through Cardinal N. P. S. Wiseman.

Contributor:
John Herschel Project
From:
Warren de La Rue
To:
Sir John Herschel
Date:
[14 January 1865]
Source of text:
RS:HS 6.165
Summary:

Would JH look through the proof of WD's speech on the presentation of a [R.A.S.] medal to Professor G. P. Bond and make any comments or suggestions.

Contributor:
John Herschel Project