| # | Clue | Answer As Given | Value | Round | Category | Air Date | Show |
|---|---|---|---|---|---|---|---|
| In the 8th century the mechanical clocks in China were driven by this | water | $500 | J | CHINESE INVENTIONS | 2001-05-29 | #3867 | |
| The Archimedean screw was used to raise this | water | $300 | J | INVENTIONS | 1995-01-05 | #2384 | |
| The "screw of Archimedes" was designed to raise this substance | water | $400 | J | INVENTIONS | 1988-10-20 | #949 |