| Year | 1940 |
| Date | 18-Jan |
| Volume | 82 |
| Issue | 2,019 |
| Page | 67 |
| Category | Workshop |
| Part | |
| Title | Gauges and Gauging |
| Author | R.Barnard Way |
| Notes | For those on National Service. Testing a square for accuracy by cylindrical gauge, the protractor vernier, the right-angled triangle, the sine bar in principle, the Pratt and Whitney sine block in use, the Pitter sine bar |