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UNIVERSITY DAILY KANSAN, LAWRENCE, KANSAS
FRIDAY, APRIL 20, 1951
Engineers Show Floating Concrete
By LOU FRY
Floating concrete is being displayed by the civil engineering department as one of their exhibits in the Engineering Exposition today and Saturday.
Concrete usually thought of as massive, heavy material, has been made light enough to float by using lightweight aggregates and controlled mixes.
That the lightweight concrete can still support a heavy load is demonstrated by a miniature prestressed concrete beam. The I-shaped beam is $3\frac{1}{2}$ inches high and has a maximum width of 2 inches. It will support a 200-pound load.
How different types of concrete are made is exhibited in the concrete laboratory in the basement of Marvin hall. Bruce Browne, engineering senior, is in charge.
Another civil engineering exhibit includes highway models which show road surfaces of concrete, asphalt, brick, and gravel. The construction of highways is depicted step by step. Ditches, grades, shoulders, and drainage culverts are shown in detail as are various models of earth moving equipment.
The state highway commission has provided graphs, designs, and specifications on sight distances to stress the need for safety with high-speed motor cars on highways. This exhibit is in 207 Marvin hall. Virgil Hoidredge, engineering senior, is in charge.
A structures exhibit is on display in 208 Marvin hall.
It features the Bailey pre-fabricated military bridge, used by combat engineers to span a river or stream in a hurry. A picture of the Golden Gate bridge in San Francisco shows its suspension cables and other structural features. W. S.
Arabella Can Be Tied, Not Beat
By DICK MARSHALL
Arabella, mechanical tie-tac-toe expert is making her second appearance as part of the electrical engineering exhibit today and Saturday.
This inhuman wonder of the age will challenge all comers, but the challenger should be warned. The best he can hope for is a tie. Arabella has a 92 per cent chance of winning, the remaining .8 per cent goes to the cat.
Brainchild of Maurice Mandelkear and Richard Harris, who attended the University the past year. Arabella is an electrically-operated robot with plenty of "guts"—200 sets of contacts, 80 relays, and 300 feet of wire.
She measures 36 by 29 inches at the base and has a panel 2 feet high for her chest. The panel is divided into nine squares with a red and green light in each square to indicate the play of Arabella and her opponent.
Arabella plays an expert game, both offensively and defensively. If the challenger wishes to make the first play he touches a metal contact, in the desired square, with an electric probe. This lights one of the lights in that square and starts the robot who then makes her play.
If the challenger wishes Arabella to make the first play, he touches a contact in the lower right-hand corner of the panel. If the challenger tries to cheat by moving twice in succession, Arabella will retaliate by doing the same.
The inventors of Arabella got the idea from a magazine article about a similar machine being constructed at the University of California for use in the psychology department of that school.
Neither Mandelkehr nor Harris had seen any plans for the construction of the machine, but set about building Arabella from parts of pinball machines that were too old or too badly damaged to be used commercially. After two months working in their spare time, they completed the robot at a cost of less than $15.
Gartung, engineering junior, is in charge of the display.
Surveying equipment, such as transits, levels, stadia and level rods, and chains, are on display in the surveying exhibit. Maps dating back to when Kansas was a territory, are on display. Carl Steeby, engineering junior, is in charge of this exhibit.
A model of the new Harlan county dam, the "magic faucet" and various instruments used for measuring water flow through pipes are part of the hydraulics exhibit.
Also featured is a clock which runs by water flow, and model power plants. The exhibit is in the hydraulics laboratory, in charge of John Vohs, engineering senior.
cludes a demonstration of supporting capacity and quality of different soil types, and methods of analysis used to determine material content.
The soil mechanics exhibit in-
The exhibit is in the soils laboratory in the basement of Marvin hall. Charles Carpenter, engineering junior, is in charge.
An exhibit of pathogenic bacteria in contaminated water is part of the sanitation display. Emphasis is given to typhoid bacteria. The treatment of river water, as found in Lawrence, is demonstrated.
The benefits of water softening in regard to soap consumption is explained in the sanitation laboratory in the east end of Marvin hall. I. B. Franklin, engineering senior, is in charge.
Frank Davis, engineering senior, is chairman for the civil engineering exhibit.
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