| Year | 1939 |
| Date | 22-Jun |
| Volume | 80 |
| Issue | 1,989 |
| Page | 739 |
| Category | Workshop |
| Part | |
| Title | A 6 in. Vernier Caliper Gauge |
| Author | H.S.Thompson |
| Notes | Making an accurate instrument in the home workshop. General arrangement, details of claws, dimensions of component parts |