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Tyndall, John in correspondent 
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Herschel3152

From:
John Tyndall
To:
Sir John Herschel
Date:
[27 November 1868]
Source of text:
RS:HS 17.403
Summary:

Is studying vesicles. JH's son [Alexander] may yet get Royal School of Mines appointment.

Contributor:
John Herschel Project

Herschel3635

From:
John Tyndall
To:
Sir John Herschel
Date:
[30 November 1868]
Source of text:
RS:HS 17.404 (C: RI 550)
Summary:

Observations on subjecting carbonic acid to concentrated beam of an electric lamp. Records experimental result so far. Interested in ordinary dust particles under electric light.

Contributor:
John Herschel Project

Herschel3536

From:
John Tyndall
To:
Sir John Herschel
Date:
[1 December 1868]
Source of text:
RS:HS 17.405a (C: RI 551-2)
Summary:

Continues experiments with carbonic acid and electric light [see JT's 1868-11-30], hoping to 'explode' idea that atmosphere's polarization is due to reflection by air particles.

Contributor:
John Herschel Project

Herschel3535

From:
Sir John Herschel
To:
John Tyndall
Date:
[2 December 1868]
Source of text:
RS:HS 17.405b (C: 24.242; C: RI 553-4)
Summary:

Thinks JT's work on polarization will lead to remarkable discovery. Discusses production of rainbow, parallels to Isaac Newton's explanation of black spot on a soap bubble, and problems in JT's undulatory theory explanation of reflection. In JT's experiments, what are nebulous particles produced by light in gas or vapor?

Contributor:
John Herschel Project

Herschel3427

From:
John Tyndall
To:
Sir John Herschel
Date:
3 December [1868]
Source of text:
RS:HS 17.412 (C: RI 555)
Summary:

Continues experiments with carbonic acid and electric light [see JT's 1868-11-30], suggesting possible cause of blue cloud color and eventual whitening of light.

Contributor:
John Herschel Project

Herschel3428

From:
John Tyndall
To:
Sir John Herschel
Date:
12 December [1868]
Source of text:
RS:HS 17.413 (C: RI 556)
Summary:

Asks JH to review paper on blue color of sky, polarization of skylight, and polarization of light by cloudy matter.

Contributor:
John Herschel Project

Herschel8359

From:
Sir John Herschel
To:
John Tyndall
Date:
[13 December 1868]
Source of text:
RS:HS 19.160b
Summary:

JT's paper on polarization of sky light suggests that neutral points are functions of cloud density. This verifies JH's earlier explanation of blue sky color. Incomplete polarization. Cause of blue color in water. Corrects note on W. A. Miller's observations of rainbows.

Contributor:
John Herschel Project

Herschel3537

From:
Sir John Herschel
To:
John Tyndall
Date:
[14 December 1868]
Source of text:
RS:HS 24.243 (C: RI 557-8)
Summary:

Thanks for paper verifying JH's prediction that explanation of blue sky color carries with it that of polarization of skylight. Involves ultimate link between chemical and analytical dynamics. Notes that 'neutral points' in sky polarization have yet to be explained; offers tentative explanation based on clues in JT's work.

Contributor:
John Herschel Project

Herschel3538

From:
Sir John Herschel
To:
John Tyndall
Date:
[28 May 1869]
Source of text:
RS:HS 17.406a (C: RI 559-60 & RS:HS 24:260)
Summary:

Thanks for paper on comets. Offers questions, problems to be resolved, particularly on termination of comet.

Contributor:
John Herschel Project

Herschel3347

From:
John Tyndall
To:
Sir John Herschel
Date:
[29 May 1869]
Source of text:
RS:HS 17.406b (C: RI 562)
Summary:

Thanks for JH's suggestions on JT's outline of comet speculations. [G. B.] Airy, too, has replied. Includes more speculations on 'envelopes' and nucleus of comet.

Contributor:
John Herschel Project

Herschel3441

From:
Sir John Herschel
To:
John Tyndall
Date:
[30 May 1869]
Source of text:
RS:HS 17.407a (C: 24.264; C: RI 563-4)
Summary:

Suggests experiments with regard to polarization and vaporization, and comets' tails.

Contributor:
John Herschel Project

Herschel3442

From:
John Tyndall
To:
Sir John Herschel
Date:
[1 June 1869]
Source of text:
RS:HS 17.407b (C: RI 565)
Summary:

In response to JH's comments on JT's explanation of comets says faintness of head and nucleus does not indicate non-existence; eye may not see all. Experiments with polarized light produce 'gorgeous' 'residual blue.'

Contributor:
John Herschel Project

Herschel3337

From:
John Tyndall
To:
Sir John Herschel
Date:
27?] June [1869
Source of text:
RS:HS 17.414 (C: RI 566)
Summary:

Encloses reference to one of JH's letters to JT that has already been printed.

Contributor:
John Herschel Project

Herschel3440

From:
John Tyndall
To:
Sir John Herschel
Date:
[16 November 1869]
Source of text:
RS:HS 17.408 (C: RI 569)
Summary:

Is delighted with JH's exposition of colors of thin plates and of measurements of a wave of light in Familiar Lectures. Asks permission to quote from it.

Contributor:
John Herschel Project

Herschel3257

From:
Sir John Herschel
To:
John Tyndall
Date:
[7 June 1870]
Source of text:
RS:HS 24.317 (C: RI 571)
Summary:

Thanks for work on diamagnetism and magne-crystallic action [Researches on Diamagnetism (1870)], which JH is excited to read. Mentions long-abandoned plans for magnetization experiments. Envies those who can see JT's 'magic' experiments at Royal Institution.

Contributor:
John Herschel Project

Herschel3210

From:
John Tyndall
To:
Sir John Herschel
Date:
[9 June 1870]
Source of text:
RS:HS 17.409 (C: RI 572)
Summary:

Gratified by JH's 'sympathy and approbation,' and that JH's writing and spirit remain 'firm' and 'fresh.'

Contributor:
John Herschel Project

Herschel3443

From:
Sir John Herschel
To:
John Tyndall
Date:
[23 October 1870]
Source of text:
RI 459 (draft : RS:HS 17.409a; C: RS:HS 24.336; C: RI 573-4)
Summary:

Thanks for paper on action of rays 'of high refrangibility' on gases and vapors. Attempts to understand reflection of wave motion on particles with diameters 'incomparably smaller' than length of wave.

Contributor:
John Herschel Project

Herschel3564

From:
John Tyndall
To:
Sir John Herschel
Date:
3 December [1870?]
Source of text:
RS:HS 17.410 (C: RI 575)
Summary:

Thanks for suggestion-filled letter. Remarks on blue color of water.

Contributor:
John Herschel Project
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