| Year | 1940 |
| Date | 15-Feb |
| Volume | 82 |
| Issue | 2,023 |
| Page | 171 |
| Category | Workshop |
| Part | |
| Title | Gauges and Gauging |
| Author | R.Barnard Way |
| Notes | For those on National Service. The micrometer caliper, an enlargement to show details of a ratchet stop, the vernier on a micrometer gauge, an internal and a depth gauge of micrometer type |