Reference numberAP/11/24
TitleUnpublished letter, regarding parallel lines and the sum of angles from J [John] Walsh to J F W [John Frederick William] Herschel
Date10 January 1824
DescriptionWalsh writes that he found [Humphry] Davy's commendation of mathematics and the work of [John] Brinkley gratifying as a mathematician. Walsh explains that in his paper he shows that the sum of the three angles of every plane triangle is equal to two right angles, independently of parallel lines. He provides an example of this rule in the letter. This is a covering letter for AP/11/25.

An inscription in brown ink at the top right corner of the first page reads '(35 JFWH [John Frederick William Herschel])'.

Subject: Mathematics

Written by Walsh in Cork [Ireland].
Physical descriptionInk on paper
Digital imagesView item on Science in the Making
Access statusOpen
Related records in the catalogueAP/11/25
Fellows associated with this archive
NA8238Herschel; Sir; John Frederick William (1792 - 1871); astronomer1792 - 1871
NA8145Brinkley; John (1763 - 1835); Bishop of Cloyne; astronomer1763 - 1835
NA8200Davy; Sir; Humphry (1778 - 1829); chemist1778 - 1829
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