| Year | 1921 |
| Date | 05-May |
| Volume | 44 |
| Issue | 1,045 |
| Page | 350 |
| Category | Workshop |
| Part | 2 |
| Title | Precision |
| Author | |
| Notes | A drilling stool, modified design for turbine gearbox, jig for operations, assembly of turbine showing gear box in position, chuck for operation 1, gauges, faceplate for operation 5, counter bore tool, jigs for operations, planning sheet |