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Hamilton, William Rowan in correspondent 
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From:
William Rowan Hamilton
To:
Sir John Herschel
Date:
[2 October 1847]
Source of text:
unknown
Summary:

The equatorial on the Dublin Observatory dome needs improvement. In the last fifty-two months, WH has seen three new planets: Neptune, Iris, and Flora.

Contributor:
John Herschel Project
From:
William Rowan Hamilton
To:
Sir John Herschel
Date:
[23 October 1847]
Source of text:
unknown
Summary:

WH notes that quaternions derive some interesting results in problems with three moving bodies.

Contributor:
John Herschel Project
From:
William Rowan Hamilton
To:
Sir John Herschel
Date:
[30 October 1847]
Source of text:
unknown
Summary:

Describes the funeral of James MacCullagh; mystified why he committed suicide.

Contributor:
John Herschel Project