| Year | 1935 |
| Date | 13-Jun |
| Volume | 72 |
| Issue | 1,779 |
| Page | 570 |
| Category | Educational |
| Part | |
| Title | First Steps in Model Engineering. Workshop Advice, Experience and Philosophy for Readers of all Ages |
| Author | "Inchometer" |
| Notes | Testing for hardness, the file test for hardness, colour tests for hardness |