| # | Clue | Answer As Given | Value | Round | Category | Air Date | Show |
|---|---|---|---|---|---|---|---|
| In 1824 British bricklayer Joseph Aspdin invented the Portland type of this | cement | $800 | J | INVENTIONS | 2004-05-28 | #4555 | |
| Joseph Aspdin, a bricklayer, invented the "Portland" variety of this substance | cement | $400 | J | INVENTIONS | 1991-01-07 | #1466 |