| Year | 1928 |
| Date | 12-Jul |
| Volume | 59 |
| Issue | 1,418 |
| Page | 33 |
| Category | Workshop |
| Part | 1 |
| Title | For the Apprentice's Tool Kit. How to Make and Proportion an Engineer's Try-Square |
| Author | |
| Notes | Sizes of square, preparing the parts: the blade, the stock, table of sizes, assembling and riveting, fitting the blade, riveting |