| Year | 2004 |
| Date | 09-Jul |
| Volume | 193 |
| Issue | 4,225 |
| Page | 26 |
| Category | General |
| Part | 2 |
| Title | How Harmonic is Your Motion? |
| Author | Ted Whale (Canada) |
| Notes | Analyses the motion of a piston in a reciprocating engine and explores its mathematical identity. Spreadsheet, demonstrator, notes in text |