TRIPP

TRIPP 05.08. 1888 Chicago IL/USA 26.07. 1971 Greensboro NC/USA James (Jim) Gregory Tripp received the BSc degree in 1910 from Massachusetts Institute of Technology MIT, Cambridge MA. He moved to the West and then worked in the construction supply business of Southern California, forming his own engineering design service. From 1917 to 1930 he devoted his time to heavy construction as a contractor, and as a general superintendent of dams built in this time, which included the Palmdale and Creek Dams in California, the Lake Pleasant Dam and the Coolidge Dam in Arizona, and a section of the River Des Peres Sewer at St. Louis MO. In 1931 he joined a firm as construction manager, then as vice-president, handling the construction of the Hoover Dam, and Panama Canal work, or operations including the Mississippi River Lock and Dam Projects No. 5 and 15. In 1937 Tripp reopened his own consulting office for contractors developing bids for clients for numerous dam projects, including the Lackawak Dam and Board of Water Supply tunnels in New York, and the Shasta Dam in California. During World War II he was again on the field, which he liked best, as operating manager for the Maritime Commission for the building of concrete tankers, and in the construction of the US Naval Base at Trinidad. After the war he went again into business for himself as a consultant which continued until his retirement in 1970. His clients numbered among the great contractors of the world, for whom he bid for work or provided on-site services, including for Folsom Dam, Hungry Horse Dam, Mount Morris Dam, Helena Dam, Niagara River power complex, Flaming Gorge Dam, Glen Canyon Dam, Yanhee Dam in Thailand, Rihand Dam in India, the water supply for Karachi, Pakistan, or the Jacuara Dam in Brazil. He was member of the Engineers Club, New York, and of the American Society of Civil Engineers ASCE, becoming ASCE Fellow in 1959. Anonymous (1928). Construction of multiple-arch dam in Arizona: Lake Pleasant Dam. Engineering News-Record 100(5): 180-183. Anonymous (1928). Construction features: Coolidge multiple-dome dam. Engineering News-Record 101(12): 438-442. Anonymous (1951). James G. Tripp, Construction Engng. Prize. Civil Engineering 21(10): 607. P Anonymous (1973). James G. Tripp. Trans. ASCE 138: 645-646. Tripp, J.G. (1940). Discussion of Core drills at Chickamauga Dam. Trans. ASCE 105: 865-867. Tripp, J.G. (1955). Construction engineer talks about tools of trade. Civil Engng. 25(10): 624-630.

TROESCH 02.03. 1920 Bern/CH 30.10. 2001 Beverly Hills CA/USA B(eat) Andreas Troesch obtained in 1947 the degree of mathematician, and the PhD degree in 1952 from Swiss Federal Institute of Technology, ETH Zurich, Zürich. He moved to the United States as research associate of applied mathematics, joining the Institute of Mathematical Sciences, the New York University, serving from 1956 to 1958 as head of the applied mathematics section, the Computing Center of the Ramo-Woolridge Corp., Torrance CA, continuing then until 1961 at Space Technology Laboratories, Redondo Beach CA, from when he was the manager of the Computing Sciences Department, Aerospace Corp., San Jose CA. He was from 1966 professor of aerospace engineering, University of Southern California, Los Angeles. He was member of the American Mathematical Society AMS, the Society of Industrial and Applied Mathematics SIAM, and of the Association for Computing Machinery ACM. The research interests of Troesch included applied mathematics and numerical analysis in hydrodynamics and gas dynamics, and both elliptic and hyperbolic partial differential equations. The 1954 Report considers problems of flood prediction on the Ohio and Mississippi Rivers by means of the finite-difference method, following James J. Stoker (1905-1992). The description includes the mesh system used. The junction problem is particularly dealt with. A theoretical analysis of steady flow and steady progressive wave features is also given. The 1956 report is concerned with the prediction of the 1945 and 1948 floods on the Ohio River, among others. The factors affecting the solution accuracy are discussed, and suggestions are provided for improvement of the numerical approach. The results are also compared with model studies. The 1958 work may be considered a synthesis of the two preceding studies. Examples indicate the flexibility of this approach, which may be counted to the very first in hydraulic engineering. Anonymous (1955). A. Troesch. Proc. 6th IAHR Congress La Haye: Frontispiece. P Anonymous (1960). Troesch, B. Andreas. American men of science 10: 4138. Cattell: Tempe AZ. Isaacson, E., Stoker, J.J., Troesch, B.A. (1954). Numerical solution of flood prediction and river regulation problems. Report IMM-NYU-205. New York University: New York. Isaacson, E., Stoker, J.J., Troesch, B.A. (1956). Numerical solution of flood prediction and river regulation problems. Report 6 IMM-NYU-235. New York University: New York. Isaacson, E., Stoker, J.J., Troesch, B.A. (1958). Numerical solution of flow problems in rivers. Proc. ASCE 84(HY5, Paper 1810): 1-16.