| Year | 1937 |
| Date | 28-Oct |
| Volume | 77 |
| Issue | 1,903 |
| Page | 434 |
| Category | Tool-Room Topics |
| Part | |
| Title | Constant Diameter Sections |
| Author | R.Hutcheson |
| Notes | A figure of non-circular shape but having a constant diameter, testing roundness by means of a comparator equipped with a Vee-block anvil |