| Year | 1937 |
| Date | 04-Nov |
| Volume | 77 |
| Issue | 1,904 |
| Page | 453 |
| Category | Tool-Room Topics |
| Part | |
| Title | A Sine Bar with Inserted Plugs |
| Author | R.Hutcheson |
| Notes | The usual type with inserted plugs, cross-sectional view of bar, coppered to prevent absorbtion of carbon, insulating against carburizing, asbestos insulation |