| Reference number | AP/11/24 |
| Level | Item |
| Title | Unpublished letter, regarding parallel lines and the sum of angles from J [John] Walsh to J F W [John Frederick William] Herschel |
| Date | 10 January 1824 |
| Description | Walsh 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]. |
| Extent | 3p |
| Format | Manuscript |
| Physical description | Ink on paper |
| Digital images | View item on Science in the Making |
| Access status | Open |
| Related records in the catalogue | AP/11/25 |
Fellows associated with this archive
| Code | Name | Dates |
| NA8238 | Herschel; Sir; John Frederick William (1792 - 1871); astronomer | 1792 - 1871 |
| NA8145 | Brinkley; John (1763 - 1835); Bishop of Cloyne; astronomer | 1763 - 1835 |
| NA8200 | Davy; Sir; Humphry (1778 - 1829); chemist | 1778 - 1829 |