| Year | 1938 |
| Date | 21-Apr |
| Volume | 78 |
| Issue | 1,928 |
| Page | 371 |
| Category | Tool-Room Topics |
| Part | |
| Title | Centred Tapered Mandrels |
| Author | R.Hutcheson |
| Notes | Design of a mandrel, tapered mandrel with reduced ends, hollow centre, roughing-out, hardening, finishing, a lap for finishing hollow centres |