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Rogers, Alexander in correspondent 
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From:
Alexander Rogers
To:
Sir John Herschel
Date:
[11 November 1807]
Source of text:
RS:HS 14.386
Summary:

Has arrived in Scotland. Recently witnessed a large comet. Thanks JH and family for hospitality at Slough.

Contributor:
John Herschel Project
From:
Alexander Rogers
To:
Sir John Herschel
Date:
[1 January 1808]
Source of text:
RS:HS 14.387
Summary:

Thanks JH for information concerning the comet. Planned to build telescope with object glasses separated from each other. Optician said this would not correct spherical and chromatic aberrations. Wants advice.

Contributor:
John Herschel Project
From:
Alexander Rogers
To:
Sir John Herschel
Date:
[22 February 1808]
Source of text:
RS:HS 14.388
Summary:

Wishes to teach privately. Asks William Herschel to write a recommendation certificate. Weather has been problematic. Sends greeting to the elder Herschels.

Contributor:
John Herschel Project
From:
Alexander Rogers
To:
Sir John Herschel
Date:
1808-3
Source of text:
RS:HS 14.389
Summary:

Concerned over illness of William Herschel. Discusses 'Evolution of Curve Lines.' Describes [Christiaan] Huygens's terms for evolution of curves. Offers advice to avoid problems with them.

Contributor:
John Herschel Project
From:
Alexander Rogers
To:
Sir John Herschel
Date:
[5 November 1808]
Source of text:
RS:HS 14.390
Summary:

Grateful for letter from Brighton. Agrees with JH concerning comet. Is suspicious of those who claim it is the same comet that was seen one year previously.

Contributor:
John Herschel Project
From:
Alexander Rogers
To:
Sir John Herschel
Date:
[2 January 1809]
Source of text:
RS:HS 14.391
Summary:

Describes the difficulty of [P. Laplace's] Mécanique céleste. Has a new pupil. Discusses proper boundary of a front view mirror.

Contributor:
John Herschel Project
From:
Alexander Rogers
To:
Sir John Herschel
Date:
[25 March 1809]
Source of text:
RS:HS 14.392
Summary:

Discusses problem of the ellipse and offers a method of solving it. States the proper boundary of a front mirror is too difficult to ascertain. Still having problems with teaching.

Contributor:
John Herschel Project
From:
Alexander Rogers
To:
Sir John Herschel
Date:
[20 September 1809]
Source of text:
RS:HS 14.393
Summary:

Describes lunar rainbow seen on 22 August. Congratulates JH on his mathematical attainments. Describes his enjoyment of mathematics. Hopes JH will continue to correspond.

Contributor:
John Herschel Project
From:
Alexander Rogers
To:
Sir John Herschel
Date:
[5 March 1810]
Source of text:
RS:HS 14.394
Summary:

Found JH's resolution of a biquadratic ingenious. AR used René Descartes's method of resolution, but found it less elegant. Discusses resolution of higher order quadratics.

Contributor:
John Herschel Project
From:
Alexander Rogers
To:
Sir John Herschel
Date:
[1 November 1811]
Source of text:
RS:HS 14.395
Summary:

Discusses the comet that 'attracts the attention of all.' Speculates that the train of comets arises from the impulse of solar rays. Discusses shape and composition of comets.

Contributor:
John Herschel Project
From:
Alexander Rogers
To:
Sir John Herschel
Date:
[6 January 1812]
Source of text:
RS:HS 14.396
Summary:

Is now a clerk for [London and Edinburgh] shipping company. Does not know if he should mention his employment to Mr. Watts.

Contributor:
John Herschel Project
From:
Alexander Rogers
To:
Sir John Herschel
Date:
[1 January 1813]
Source of text:
RS:HS 14.397
Summary:

Dr. [Charles] Burney offered him a position at his academy. He will, however, remain at the shipping company.

Contributor:
John Herschel Project
From:
Alexander Rogers
To:
Sir John Herschel
Date:
[14 June 1813]
Source of text:
RS:HS 14.398
Summary:

Congratulates JH on his progress in mathematics. Discusses forces of attraction and his employment at the shipping company.

Contributor:
John Herschel Project
From:
Alexander Rogers
To:
Sir John Herschel
Date:
[20 February 1814]
Source of text:
RS:HS 14.399
Summary:

Congratulates JH on the formation of the [Analytical] Society, which will let Britain 'take the lead' in mathematics. Discusses analysis of a radical.

Contributor:
John Herschel Project
From:
Alexander Rogers
To:
Sir John Herschel
Date:
[5 October 1814]
Source of text:
RS:HS 14.400
Summary:

Describes an oil lamp that makes efficient use of all the oil placed in it.

Contributor:
John Herschel Project
From:
Alexander Rogers
To:
Sir John Herschel
Date:
[7 December 1827]
Source of text:
RS:HS 14.401
Summary:

Left his job because of precarious health. Is retired. Discusses achromatic telescopes and his ideas for correcting spherical and chromatic aberrations.

Contributor:
John Herschel Project
From:
Alexander Rogers
To:
Sir John Herschel
Date:
[26 February 1828]
Source of text:
RS:HS 14.402
Summary:

Sends copy of his account of the achromatic telescope because JH did not receive the original. Constructing an achromatic telescope of 5-foot focal length.

Contributor:
John Herschel Project
From:
Alexander Rogers
To:
Sir John Herschel
Date:
[12 April 1828]
Source of text:
RS:HS 14.403
Summary:

Recently received telescope from the optician. Some adjustments are necessary. [Robert] Blair has a similar idea regarding telescopes. Asks JH to mention his idea to the Astronomical Society.

Contributor:
John Herschel Project
From:
Alexander Rogers
To:
Sir John Herschel
Date:
[25 April 1828]
Source of text:
RS:HS 14.404
Summary:

Gives permission to release his telescope proposal to others. Discusses the progress of the telescope. Considers modifying the arrangement of lenses.

Contributor:
John Herschel Project
From:
Alexander Rogers
To:
Sir John Herschel
Date:
[18 July 1828]
Source of text:
RS:HS 14.405
Summary:

Asks JH to report how James South's telescope performs. There was a defect in the settings of the telescope. Hopes JH's method of eliminating chromatic aberration improves the microscope.

Contributor:
John Herschel Project