| Year | 1992 |
| Date | 20-Nov |
| Volume | 169 |
| Issue | 3,933 |
| Page | 624 |
| Category | Right First Time |
| Part | 13 |
| Title | 'Gearing up for Today' |
| Author | Rapier |
| Notes | Points out the advantages of today's "doubled-up" gear tooth sizes. Sizes with different meanings, the reciprocal module, scaling diametrical pitches, the tooth range available |