Thomas Midgley
Numéro d’image : 11829906
| Thomas Midgley (1889-1944),American engineer and inventor,with the Delco laboratory test engine. Working for Delco in World War I,he led a team working on 'knocking' in petrol engines. He found that tetra-ethyl lead (when used with 1,2-dibromo-ethane to reduce lead oxide deposits in the engine) is highly effective at reducing knocking when added to petrol. The mixture is still used as an anti-knock additive today. Midgley also devised the octane number method of rating petrol quality. In 1930 he introduced Freon 12 as a non-toxic non-flammable agent for domestic refrigerators. Both his main discoveries have since been implicated with environmental problems | |
| Licence : | Droits gérés |
| Crédit: | Science Photo Library |
| Taille de l’image : | 2534 px × 3901 px |
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