The boundary between the known and the unknown changes location and never vanishes

. . .

• 1921, Seismic reflection work begun by Geological Engineering Company
  
  
• 1932, Automatic Gain Control and interchangoeable analog filters developed
  
  
• 1939, Started using "closed loops" to check misties
  
  
• 1950, Harry Maynes experiments with CDP method
  
  
• 1956, Central Data Processing and stacking of record sections
  
  
• 1976, Gulf and GSI 3-D seismic survey
  
  
• 1982, Cyber-200 and Cray-1 Vector Processors
  
  
• 1983, Interactive 3-D interpretation workstations
  
  
• 1993, Halliburton Time-Lapse Seismic in the Norwegian North Sea
  
  
• 1998, Immersive Environments
  
  
• Recall Nigel Anstey's talk at the Ostend EAEG: The Last Dry Hole

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