# Milestones in the History of Dislocations

| Theory of Elasticity | Timpe (1905) Voltaterra (1907) |
| Theoretical shear limit | Frenkel (1926) |
| "Verhakungen" | Dehlinger (1929) |
| Postulate of (edge) dislocations | Orowan (1934) Polanyi (1934) Taylor (1934) |
| Postulate of screw dislocations | Burgers (1939) |
| Multiplication mechanism of dislocations | Frank-Read (1950) |
| Direct observation of dislocations by TEM | Hirsch et al. (1956) |
| Dislocation free Si crystal growth | Dash (1960) |