| Year | 1993 |
| Date | 13-Aug |
| Volume | 171 |
| Issue | 3,951 |
| Page | 223 |
| Category | Pete's Page |
| Part | 2 |
| Title | A Sine Bar |
| Author | Peter Spenlove-Spenlove |
| Notes | Describes refinements. Variations and helpful ideas, a refined version, it is not just for marking out! Possible problems |