| Level | Item |
| Ref No | L/E/65/76 |
| Alt Ref No | E(L)/65/76 |
| Title | Industrial Rhythm \ Guide to Effort Graphs |
| Date | 17 January 1951 |
| Extent | 4 sheets |
| Description | Printed typed manuscript and diagrams. |
| Language | English |
| Physical Description | Original reference number was IR/IX/3b. Pages numbered 2-4. |
| Format | Papers |