| Reference number | AP/24/2 |
| Level | Item |
| Title | Unpublished paper, 'Triple register for every multiplication' by J H Backs |
| Creator | Backs; J H (fl 1841) |
| Date | 22 October 1841 |
| Description | Backs shares an abridged version of a triple register he has invented which is 'useful for every multiplication where the greatest number not exceeds 2000'.
Subject: Mathematics / Arithmetic
Written by Backs in Hamburg. |
| Extent | 28p |
| Format | Manuscript |
| Physical description | Ink on paper |
| Digital images | View item on Science in the Making |
| Access status | Open |