Jules Triger (1801–1867) was a French mining engineer who invented the 'Triger process' for digging through water logged ground.
The work is done inside a chamber (known as a caisson) open at the bottom and in which compressed air is pumped to keep water out. Originally developed for use in a coal mine (1839), it was later applied to bridge construction as well. The process was used for the Brooklyn Bridge (1870) in the United States and the Forth Railroad Bridge in Scotland among others. The health hazards of working in a hyperbaric environment were gradually discovered during these projects. The process was also used by Gustave Eiffel for the foundations of two of the four pillars supporting the Eiffel tower. The name of Triger is inscribed on the Eiffel tower.
- sometimes mistakenly quoted as Jacques Triger; Jules according to Rudolph Glossop: Jules Triger 1801-1867, in: Geotechnique, Vol. 30, 1980, pp. 538-539
- Davis, RH (1955). Deep Diving and Submarine Operations (6th ed.). Tolworth, Surbiton, Surrey: Siebe Gorman & Company Ltd. p. 693.
- Acott, C. (1999). "A brief history of diving and decompression illness.". South Pacific Underwater Medicine Society Journal 29 (2). ISSN 0813-1988. OCLC 16986801. Retrieved 2009-03-17.
- A. Banyai: A great invention with built-in hazards (1975)
- A french article on J. Triger written by François Martin, for Tunnel et Ouvrages Souterrains (2004).