| Thomas Waldford - English inventor | Created the first weaving machine (1748). |
| Bockmüll - German engineer | Perfected the iron trade. |
| Perrault - French inventor | Patent of the wood trade (1784). |
| Charles-François Richard - Industrial | Introduced steam in Saint-Chamond. |
| Joseph de Montgolfier - Demonstrator at the Conservatory | Presented Perrault's model (1807). |