Search: Herschel, John in author 
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1840-1849::1840 in date 
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Herschel3491

From:
Sir John Herschel
To:
John William Lubbock
Date:
[1840]
Source of text:
RS MM 11.191
Summary:

On the 'misfortunes & mishaps' of the Aden magnetic observatory and on the proper care of magnetical instruments.

Contributor:
John Herschel Project

Herschel3521

From:
Sir John Herschel
To:
James David Forbes
Date:
[3 March 1840]
Source of text:
St. Andrews 12 (C: RS:HS 25.6.1 & TxU:H/L-0157; Reel 1054)
Summary:

Outlines theory behind and method for preparing thermographic paper, which allows observers to determine 'what share each ray of the spectrum bears in producing the observed total effects.'

Contributor:
John Herschel Project

Herschel3527

From:
Sir John Herschel
To:
[John William Lubbock]
Date:
[31 May 1840]
Source of text:
RS LUB.H.356a
Summary:

Will be unable to attend Council meeting, but comments on issue to be discussed of whether R.S.L. should do anything respecting observatory at Hammerfest (North Cape).

Contributor:
John Herschel Project

Herschel3595

From:
Sir John Herschel
To:
James David Forbes
Date:
[13 March 1840]
Source of text:
St. Andrews 13 (C: RS:HS 22.44)
Summary:

On the preparation of paper to exhibit a thermal spectrum.

Contributor:
John Herschel Project

Herschel3640

From:
Sir John Herschel
To:
William Rowan Hamilton
Date:
[12 January 1840]
Source of text:
TCD 1493:184
Summary:

Notice on the 'final laying up' of the Old Telescope, with a 'Requiem of the Forty-Foot Reflector,' sung by JH's family on New Year's Eve.

Contributor:
John Herschel Project

Herschel3656

From:
Sir John Herschel
To:
[R.S.L. Council]
Date:
[1840?]
Source of text:
RS RR.1.3
Summary:

Reports on and enthusiastically recommends for publication G. B. Airy's paper on light polarity [see RSPT, 130 (1840), 225-], which JH believes contains true explanation for phenomenon of spectra bands.

Contributor:
John Herschel Project

Herschel3667

From:
Sir John Herschel
To:
Richard Sheepshanks
Date:
25] February [1840
Source of text:
RS:HS 16.10 (C: RS:HS 25.9.4)
Summary:

Alerts RS to the fact that there is an 'underhand sale' of the prints of [H. W.] Pickersgill's portrait of JH going on, as JH's cousin bought one.

Contributor:
John Herschel Project

Herschel3669

From:
Sir John Herschel
To:
Richard Sheepshanks
Date:
[2 March 1840]
Source of text:
RS:HS 16.12 (C: RS:HS 25.9.5)
Summary:

JH concerned not so much that a few copies of the print of JH's portrait may have been sold, but that the plate itself may have been stolen and sold. Seems relieved to know that the plate was left with the printer, not the engraver. Asks RS to make an inquiry with the printer.

Contributor:
John Herschel Project

Herschel3671

From:
Sir John Herschel
To:
Richard Sheepshanks
Date:
1840-4
Source of text:
RS:HS 16.14 (C: RS:HS 25.9.6)
Summary:

Thanks RS for all the trouble he took with the problem of his portrait. Is anxious to see the specimens of the engraved nebulae of which RS spoke, but confesses little hope in photographic 'reverses' of pencil drawings. Has installed his family at Collingwood.

Contributor:
John Herschel Project

Herschel3765

From:
Sir John Herschel
To:
Caroline Lucretia Herschel
Date:
[7?] April 1840
Source of text:
TxU:H/L-0585.3; Reel 1058
Summary:

Packing up the 7-ft. and 10-ft. reflecting telescopes for their trip to Collingwood in Hawkhurst in Kent, JH's new home.

Contributor:
John Herschel Project

Herschel3766

From:
Sir John Herschel
To:
Caroline Lucretia Herschel
Date:
[10 August 1840]
Source of text:
TxU:H/L-0585.7; Reel 1058
Summary:

JH has given away his sweeping telescope to [Johann] Hausmann and the 5-ft. Newtonian reflector to the R.A.S. to be preserved 'long after I and all the little ones are dead and gone.' The skies have been excellent for JH to observe variable stars and to connect the northern with the southern magnitudes. Proved that Alpha Orionis is both a variable star and a periodical star.

Contributor:
John Herschel Project

Herschel3767

From:
Sir John Herschel
To:
Caroline Lucretia Herschel
Date:
[5 November 1840]
Source of text:
TxU:H/L-0585.14; Reel 1058
Summary:

JH and family are beginning to feel at home at Collingwood.

Contributor:
John Herschel Project

Herschel378

From:
Sir John Herschel
To:
George Biddell Airy
Date:
[16 May 1840]
Source of text:
RGO 6.463.70
Summary:

Has a problem with the explanation of interference bands produced by mica being placed between the eye and prism-produced dispersion; the explanation is Baden Powell's.

Contributor:
John Herschel Project

Herschel379

From:
Sir John Herschel
To:
George Biddell Airy
Date:
[1840-5-16 or later]
Source of text:
RGO 6.463.76
Summary:

Writes to supply GA with an address for a reply to JH's 1840-5-16.

Contributor:
John Herschel Project

Herschel3805

From:
Sir John Herschel
To:
Robert Hunt
Date:
[10 November 1840]
Source of text:
George Eastman House, 4.17 (C: RS:HS 22.70)
Summary:

Does not know anywhere that such processes as RH uses are used for registry work, although the idea is frequently raised.

Contributor:
John Herschel Project

Herschel381

From:
Sir John Herschel
To:
George Biddell Airy
Date:
[19 May 1840]
Source of text:
RGO 6.463.78
Summary:

Thanks GA for the time and trouble GA took in writing about interference bands [see GA's 1840-5-17]; JH's wife, Margaret, is making many visits to the dentist.

Contributor:
John Herschel Project

Herschel382

From:
Sir John Herschel
To:
George Biddell Airy
Date:
[1840-5-20 or later]
Source of text:
RGO 6.463.81
Summary:

A note agreeing with GA about prism interference [see GA's 1840-5-20].

Contributor:
John Herschel Project

Herschel3946

From:
Sir John Herschel
To:
Robert Hunt
Date:
[12 May 1840]
Source of text:
George Eastman House, 3.17 (C: RS:HS 22.15)
Summary:

Will forward RH's paper to the R.S.L.; intrigued by RH's results using mercury vapor to produce the image on exposed paper.

Contributor:
John Herschel Project

Herschel3990

From:
Sir John Herschel
To:
Caroline Lucretia Herschel
Date:
1840-8
Source of text:
TxU:H/L-0585.8.a; Reel 1058
Summary:

Reports that there is no bust of William Herschel at the R.S.L., as JH once believed.

Contributor:
John Herschel Project

Herschel4034

From:
Sir John Herschel
To:
Robert Hunt
Date:
5] April [1840
Source of text:
George Eastman House, 2.17
Summary:

Hopes that his paper does not anticipate any of RH's work; will share with the R.S.L. any of RH's results. Laments that he is unable to fix the spectral colors on photographic paper. Asks if RH has studied the bromines.

Contributor:
John Herschel Project
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