. Morton memorial; a history of the Stevens institute of technology, with biographies of the trustees, faculty, and alumni, and a record of the achievements of the Stevens family of engineers. r of the Delta TauDelta fraternity; and of the Whitehall Cluband the American Society of London. Tiemann, Harry Donald (, 97), wasborn in Brooklyn, N. Y., March 26, 1875;son of J. H. and M. A. Tiemann. His great-uncle, Daniel F. Tiemann, was mayor ofNew York. The subject of this sketch wasInstructor in a correspondence school, 1897-98; Instructor in Physics and Chemistry atthe Pratt Institute, Brookl
. Morton memorial; a history of the Stevens institute of technology, with biographies of the trustees, faculty, and alumni, and a record of the achievements of the Stevens family of engineers. r of the Delta TauDelta fraternity; and of the Whitehall Cluband the American Society of London. Tiemann, Harry Donald (, 97), wasborn in Brooklyn, N. Y., March 26, 1875;son of J. H. and M. A. Tiemann. His great-uncle, Daniel F. Tiemann, was mayor ofNew York. The subject of this sketch wasInstructor in a correspondence school, 1897-98; Instructor in Physics and Chemistry atthe Pratt Institute, Brooklyn, 1898-99; In-structor in Mechanical Engineering at theUniversity of Pennsylvania, 1899-1900: wasengaged in the Department of Forestry (nowa Bureau) at Washington, doing both officeand field work, 1900-01; and is now in theBureau of Forestry in charge of the Yaletimber-testing laboratory. He took the course at the Yale Forest School, and gradu-ated with the degree of Master of Forestry,1903. His thesiSj on Gas Engines, waspublished in the Stevens Institute Indicator,to which he also contributed an article on The ]\Iechanical Relation of Force andMass, in 1901. In the same year he in-. H. D. Tiemann vented a hypsometer for measuring theheight of trees. Tischner, Charles Frederick, Jr. (, 02),was born in New York city October 10,1879; son of Charles Frederick and AnnieJane Maddock Tischner. After graduationhe entered the draughting-room of the Gen-eral Building & Construction Co., andshortly afterward began patent law work, inwhich he is still engaged. He is an associatemember of the American Institute of Elec-trical Engineers; a junior member of theAmerican Society of Mechanical Engineers;and a member of the Phi Sigma Kappa andTheta Nu Epsilon fraternities. Toby, Edward M. (, 96), was en-gaged in the Department of Tests at StevensInstitute, 1896; in the General Electric , Schenectady, N. Y., 1896-97; andhas been with the National Contracting Co.,New York, from
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