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1850-1859::1856 in date 
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Showing 81–99 of 99 items

Herschel7877

From:
Henry Warburton
To:
Sir John Herschel
Date:
[15 May 1856]
Source of text:
RS:HS 18.81
Summary:

Glad that JH shows renewed interest in mathematics. Besides HW, JH, Augustus De Morgan, and Mr. Gerard, there appear to be no others interested in researching the differences of the powers of zero. Gave outline of HW's paper at Cambridge Philosophical Society. Plans to revise it according to suggestions from JH and De Morgan.

Contributor:
John Herschel Project

Herschel7878

From:
Henry Warburton
To:
Sir John Herschel
Date:
[17 May 1856]
Source of text:
RS:HS 18.82
Summary:

Quick way to determine coefficients in tables of differences of powers of zero.

Contributor:
John Herschel Project

Herschel7879

From:
Henry Warburton
To:
Sir John Herschel
Date:
[25 May 1856]
Source of text:
RS:HS 18.83
Summary:

Sends law of coefficients, for developing summation theorem.

Contributor:
John Herschel Project

Herschel7880

From:
Henry Warburton
To:
Sir John Herschel
Date:
[26 May 1856]
Source of text:
RS:HS 18.84
Summary:

Coefficients of differences of odd powers of zero observe same law as those of even powers. Example of table of coefficients of differences of 015. Table took 15 minutes to compute by HW's process of summation. Notes error in table for 012 sent earlier.

Contributor:
John Herschel Project

Herschel7883

From:
Henry Warburton
To:
Sir John Herschel
Date:
[30 May 1856]
Source of text:
RS:HS 18.86
Summary:

Glad for JH's renewed interest in mathematics. At 72, HW expects to do no more. Reviewed JH's letter of 14 May [1856]. Fears JH misunderstood meaning of symbol HW employed. Quotes explanation from HW's paper on self-repeating series.

Contributor:
John Herschel Project

Herschel7884

From:
Henry Warburton
To:
Sir John Herschel
Date:
[2 June 1856]
Source of text:
RS:HS 18.87
Summary:

Reflects on relations between differences of same power of zero. Reviews procedure developed for determining terms and law of coefficients. JH's critique expanded role for these, but HW disagrees with JH's latest comments.

Contributor:
John Herschel Project

Herschel7936

From:
John Welsh
To:
Sir John Herschel
Date:
[15 July 1856]
Source of text:
RS:HS 18.139
Summary:

Describes R.S.L.'s compound magnet. Recommends cleaning and remagnetizing. Awaits JH's instructions.

Contributor:
John Herschel Project

Herschel7978

From:
Alexander Wight, Jr.
To:
Sir John Herschel
Date:
[28 March 1856]
Source of text:
RS:HS 18.245
Summary:

New method for constructing circular lenses up to 10-feet diameter for £50. Focusing power sufficient to melt metals. Wants to send 3-inch sample to JH.

Contributor:
John Herschel Project

Herschel7979

From:
Alexander Wight, Jr.
To:
Sir John Herschel
Date:
[3 April 1856]
Source of text:
RS:HS 18.246
Summary:

Sends small lens. Its components neither parallel nor concentric; contains water. Suggests new polishing method. Estimates 4-foot lens would cost £7-£8. [JH Note: Tested and returned lens. Noted advantages and deficiencies and suggests improvements. Listed others who built similar lenses.]

Contributor:
John Herschel Project

Herschel7980

From:
Alexander Wight, Jr.
To:
Sir John Herschel
Date:
[9 April 1856]
Source of text:
RS:HS 18.247
Summary:

Lens safely returned. Not aware of lenses in 1851 Exhibition or of C. F. Sturm's solid lenses. Notes advantages of plate glass. Offers to make three foot by three foot square lens. Recognizes limitations for use in astronomy; hopes for other applications.

Contributor:
John Herschel Project

Herschel8109

From:
Edward Wolstenholme Ward
To:
Sir John Herschel
Date:
[28 December 1856]
Source of text:
RS:HS 18.375
Summary:

Sad to hear of JH's suffering and retirement from Mint. Describes production rates, problems, equipment, personnel, and quality of gold at Sydney mint. Starting an observatory. G. B. Airy promises to send astronomer. New South Wales legislature is not friendly to scientific research. Describes Australian society.

Contributor:
John Herschel Project

Herschel9285

From:
Alexander John Ellis
To:
Sir John Herschel
Date:
[9 April 1856]
Source of text:
RS:HS 7.39
Summary:

Sending his completed universal alphabet with comments.

Contributor:
John Herschel Project

Herschel9377

From:
Charles Elouis
To:
Sir John Herschel
Date:
[24 July 1856]
Source of text:
RS:HS 7.130
Summary:

Pleased to hear from Capt. E. W. Ward's letter that JH still remembered him. Grieves to hear of his bad health. Mint at Sydney is progressing. Rich gold fields at Victoria. Looks forward to the re-establishment of steam communication.

Contributor:
John Herschel Project

Herschel9465

From:
Few & Co.
To:
Sir John Herschel
Date:
[14 April 1856]
Source of text:
RS:HS 7.211
Summary:

Thanks for the check. Will search for the deeds.

Contributor:
John Herschel Project

Herschel9469

From:
Henry W. Field
To:
Sir John Herschel
Date:
[15 December 1856]
Source of text:
RS:HS 7.215
Summary:

Congratulations on the success of his son at Addiscombe.

Contributor:
John Herschel Project

Herschel9470

From:
Henry W. Field
To:
Sir John Herschel
Date:
[23 December 1856]
Source of text:
RS:HS 7.216
Summary:

Pleased to hear of his improved health. Has sent some of the substance he requested. Affairs at the Mint not very satisfactory.

Contributor:
John Herschel Project

Herschel9582

From:
Peter le Neve Foster
To:
Sir John Herschel
Date:
[5 November 1856]
Source of text:
RS:HS 7.323
Summary:

Thought that the book presented by JH had come from Algernon Percy (4th Duke of Northumberland); regrets the error.

Contributor:
John Herschel Project

Herschel9813

From:
Alexander Hamilton-Gordon
To:
Sir John Herschel
Date:
[11 February 1856]
Source of text:
RS:HS 8.148
Summary:

Would like a letter from JH giving him authority to have the box to open. Is busy with the Report.

Contributor:
John Herschel Project

Herschel9885

From:
John Gorham
To:
Sir John Herschel
Date:
[8 May 1856]
Source of text:
RS:HS 8.219
Summary:

Has he repeated his experiments with the photographic representation of the prismatic structure? Regarding a numerical nomenclature for the colors.

Contributor:
John Herschel Project
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