ELLMS R.W. 24.11. 1903 Cincinnati OH/USA 14.05. 2000 Cleveland OH/USA Robert Wilton Ellms graduated in 1927 from Case School of Applied Science, Cleveland OH, and he obtained the MS degree in mechanical engineering there in 1930. He started his professional career by designing traveling cranes at Cleveland, becoming subsequently connected with the Pennsylvania Water & Power Company, Baltimore MD, as a hydraulic test engineer. He was in charge of model tests on turbine units installed at Safe Harbor PA. In 1930 he was appointed head of research work on coke crushers in Pittsburgh PA, a work that led to the introduction of new crushing methods. Later in his career he was a staff member of a manufacturing company at Cleveland, with research on surface finishing methods, including brushes and brushing, as well as molding machines and methods for foundries using sand molding. He was a member of the American Society of Mechanical Engineers ASME. Ellms has published two notable papers. His 1928 work deals with the tailwater depth of a so-called classical jump, and the extension to a hydraulic jump on a sloping channel. From the origins of the interest to this basic hydraulic phenomenon in the early 19th century, few additions were made, particularly as regards the slope effect. Ellms applied the momentum equation to obtain a generalized formula of the well-known Bélanger equation which includes the slope effect. He tested the result with selected laboratory observations and found general agreement. Note that Joseph W. Ellms (1867-1950) was his father, who had previously worked on a similar topic. Following the discussions on this paper, Ellms prepared in 1932 an improved version obtaining again a generalized Bélanger equation. He noted that by increasing the bottom slope the height of the jump decreases, so that in general more energy is dissipated in jumps produced by a sloping channel as compared with the horizontal channel. It was also stated that there exist relatively few hydraulic differences between the two jump types, at least for bottom angles up to 17°. In the discussion of the 1932 paper, additional questions arose so that the topic was reconsidered in the next decades. Ellms, R.W. (1927). A study of certain hydraulic jump coefficients. Case School: Cleveland OH. Ellms, R.W. (1928). Computation of the tail-water depth of the hydraulic jump in sloping flumes. Trans. ASME 50(HYD-5): 1-10. Ellms, R.W. (1932). Hydraulic jump in sloping and horizontal flumes. Trans. ASME 54(HYD-6): 113-121. P

EMERSON 26.05. 1882 Saginaw MI/USA 18.02. 1931 Cheyenne WY/USA Frank Collins Emerson obtained the BSc degree in civil engineering from University of Michigan, Ann Arbor MI, in 1904. He moved to West settling in Wyoming, where he first was engaged in his private practice, including irrigation projects. From 1905 he was employed by the La Perle Ditch and Reservoir Company, Douglas WY, and then served a railways company as assistant engineer. In 1906 he worked for the Wyoming State Engineer to locate two large canals on the Shoshone Indian Reservation. Fifteen years later the Wyoming Canal was built along this plan. In 1907 he was appointed chief engineer of the Wyoming Land and Irrigation Company in charge of the location, design, construction and operation of the irrigation projects on Paint Rock in the Big Horn Basin. In 1909 the Shell Canal providing water for 45 km2 was completed, but water shortage forced to build the Adelaide Lake Reservoir, for both of which Emerson contributed his work. Emerson was appointed in 1914 superintendent of the Big Horn Canal Association, Worland WY, supervising the reconstruction of the Big Horn Canal. Later he supervised also the Lower Hanover Canal Association. Until 1919 he was in parallel also engaged in general engineering practice, mainly in irrigation and drainage. He was then appointed State Engineer of Wyoming. Until his death he played a leading part in the development of the Wyoming’s water resources. He had been appointed Wyoming Commissioner on the Joint Colorado River Commission in 1921, resulting in the signing of the famous Colorado River Compact in 1922. It was mainly through the untiring efforts of Emerson that finally the development of the Boulder Canyon became possible. He was in 1926 elected Governor of Wyoming so that he could also develop the State by political input. However, his health was impaired by hard work during the re-election campaign in 1930. After a strong cold, pneumonia set in resulting finally in his death. He had been a builder, belonging to the long line of pioneers who through unfaltering determination developed the resources of the Nation. He was elected member of the American Society of Civil Engineers ASCE in 1918, and served also in its Irrigation Division. Anonymous (1932). Frank C. Emerson. Trans. ASCE 96: 1470-1474. Emerson, F.C. (1921). Irrigation laws and laws relating thereto of Wyoming State. Cheyenne. Emerson, F.C. (1925). Water conservation and control in Wyoming. Seattle WA. Tyler, D. (2003). Western water compacts. University of Oklahoma Press: Norman OK. https://www.nndb.com/people/660/000210030/ P