| Year | 1921 |
| Date | 07-Apr |
| Volume | 44 |
| Issue | 1,041 |
| Page | 276 |
| Category | Workshop Topics |
| Part | |
| Title | Setting out Gear Teeth |
| Author | |
| Notes | Pinion teeth, shape of a 15-tooth involute pinion, initial setting out for 12-teeth involute, to set out involute pinion teeth of less than 30, correcting the addendum curve of 12-teeth involute |