| The Encyclopedia of World History. 2001. |
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| 5. Technological Developments |
| | (See 1913)| The major achievements in technology follow. | 1 |
| | | a. Energy and Materials |
| 1921 |
| | | Tetraethyl lead, gasoline antiknock additive, produced by Thomas Midgley (1889–1994). | 2 |
| | | 1930–35 |
| | | Development of first commercially practicable catalytic cracking system for petroleum by Eugene J. Houdry (1892–1962). | 3 |
| | | 1930–37 |
| | | Development of gas turbine unit for jet propulsion in aircraft by Frank Whittle. | 4 |
| | | 1942 |
| | | DAWN OF THE NUCLEAR AGE. The first self-sustaining nuclear chain reaction achieved at Stagg Field, Chicago, by Enrico Fermi (1901–54). The first full-scale use of nuclear fuel to produce electricity occurred at Calder Hall (England) in 1956. | 5 |
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| The Encyclopedia of World History, Sixth
edition. Peter N. Stearns, general editor. Copyright © 2001 by Houghton Mifflin Company. Maps by Mary Reilly, copyright © 2001 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved. |
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