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UNIVERSITY DAILY KANSAN, LAWRENCE, KANSAS
MONDAY, FEBRUARY 23, 1948
Official Bulletin
Feb. 23, 1948
Physical Therapy club, 7:30 to night, projection room, Fraser. Two films.
Bounders fraternity, 7:30 tonight.
Memorial Union.
Coffee and Forums, 4 p.m. to tomorrow, Pine room, Union. A. L. Pritchard to speak on "Economic Consequences of the War."
Students interested in trying out for solo part of "Campus Daze" call Jess Stewart, 552 or Jim McCaig, 664 by Wednesday.
by Wednesday.
Morning devotions each day, 8:30-
8:50 a.m. during Lent at Danforth
chapel.
Consequences
Tau Beta Pi, 7:30 p.m. tomorrow,
recreation room, Union Mr. J.
surface, speaker. Refreshments.
Fencing club, 7.30 p.m. tomorrow, 110. Rahimian.
S. A.M., 7:30 p.m. tomorrow, Union ballroom. John W. Harris, Dist. Mgr., Proctor & Gamble, speaker.
KUJ. Entomology club regular meeting time changed to 4 p.m. tomorrow ___
A. S.T.E. $ p.m. tomorrow, Fowler shops. Engineering exhibition plans will be presented. Movie. Refreshments.
Y.M.C.A. cabinet, 5 p.m. tomorrow,
Pine room, Union
Jewish Student Union, 5 p.m. tomorrow. Myers hall.
Archery club practice, 5 to 7 p.m.
tomorrow and 4 to 6 p.m. Wednesday.
Robinson annex.
Proficiency examination in English composition will be given Saturday, April 10, instead of March 6. Time and place to be announced later.
University. Women's club group meetings Thursday.
Pidi Kappa Sigma, 7 tonight, Pine room.
Institute of Aeronautical Sciences,
7:30 p. m. Wednesday, quonset hut,
rear Marvin hall. Jerry Davidson of
C. A. A., speaker.
Slide rule course, 7 tonight, 426 Lindley. Second section, 7 p. m. Thursday, 9 Frank Strong.
I. S. A. Conucil, 7:15 tonight, 228 Frank Strong. Important that all members attend.
Ten delegates will represent the University Y. M. C. A. during Religious Emphasis week at Park College, Portville, Mo.
10 Go To Perk College Religious Emphasis Program
The delegates are Lorna E. Green and Mary W. Lees, College seniors; Olive Michner, Jay V. Grimm and John M. Wetmore, College juniors; Harrison E. Madden and John L. Eberhardt, College sophomores; and Elmer R. Rusco and Harry P. Lees, College freshman.
D. Ned Linearag, executive secretary of the University Y. M. C. A., will accompany the students.
Geological Survey, Man Attends Engineers' Meeting
Earl K. Nixon of the state Geological Survey is attending the meeting of the American Institute of Mining and Metallurgical Engineers in New York.
Mr. Nixon said that he will observe trends in the use of economic raw materials. He also hopes to get ideas for the Geological Survey. His duties are concerned with the economic geology of Kansas.
Zoology Club To Hear Talk On Gene Action Mechanism
Dr. Ernest W. Caspari will speak on "Mechanisms of Gene Action" at zoology seminar 4 p. m. today at 101 Snow hall.
Dr. Caspari is from the department of genetics at Carnegie Institute of Washington.
Members of the biological department are invited.
University Daily Kansan
Mail subscription: $3 a semester. $4.50 a year, (in lawen add $1.00 a semester) ostage). Published in Lawrence, Kan., every afternoon during the University year except Saturdays and weekends for examination periods. Entered as second class matter Sept. 17, 1910, at the Post Office at Lawrence, Kan., under act of March 3, 1879.
APO To Arrange Visitation Day
Five members of Alpha Phi Omega, service fraternity, were appointed Thursday to arrange a program for Scout Visitation day to be held at the University April 17.
Members of the committee are William LaCombe, chairman; William Allen Stewart, Donald Yockey, Orilton Shumate, and Austin Pickering. Donald Wilkie, who arranged the event last year, will advise the committee.
Clarence Atkins, president, reported that Rockhurst college had requested information on the lost and found department. Atkins attended a banquet honoring Dean Arno Nowotny, national president, in Kansas City Feb. 13.
A meeting of the executive committee will be held at 6 p.m. tomorrow in the lost and found office in the Union.
Jam-proof windows that raise and lower by fingertip control, electrically, are among motordom's 1943 features.
Research simplifies print making with development of "Varigam" Paper
Chemists and physicists make important contributions
tion of the spectrum and is also sensitive to light in the green region, with low contrast.
The action of "Varigam" depends on the ability of certain dyes to extend the sensitivity of silver halide emulsions beyond the blue and blue-green regions. This effect was well known to scientists. But "Varigam" has an added feature — it gives high contrast in the blue por-
To eliminate this expensive, unwieldy situation, scientists developed "Varigam" variable contrast photographic paper. With "Varigam," the whole procedure of getting different degrees of contrast is reversed. Instead of using several grades of paper, the photographer uses only one. He gets variation in contrast by use of filters that control the wave lengths of light reaching the paper, thereby getting finer degrees of contrast than are otherwise possible.
Photographic film that has been overexposed or overdeveloped usually means a "hard" or "contrasty" negative—too much silver is deposited on the highlights in comparison with that in the shadows. The opposite effect, a "soft" or "thin" negative, results from under-exposure or underdevelopment. At one time photographers had to stock four or five grades of enlarging paper to correct for these conditions and get the right degree of contrast.
"Variaam" the work of many men
The first job was one for the physical chemists. Silver halide emulsions, normally sensitive to blue light, had to be made to give maximum contrast when exposed to light in this region.
It was known that certain dyes would extend the sensitivity of the emulsion over as far as the infra-red. But they were not practical for photographic paper, being affected by the red safety light used in the darkroom. Research by chemists showed that certain dyes such as 1:1'-diethylthiopseoicyanine iodide extended the light sensitivity only to the green region. And, most important, they produced low contrast when used in lower-than-normal concentrations. When such a dye was combined with high-contrast silver halide emulsion, the result was an emulsion that gave high-contrast prints when exposed to blue light, and low-contrast prints when exposed to green light.
Physicists Develop Filters
Physicists made this contrast control a reality by preparing sharp-cutting filters that allow the user to control his printing light selectively. These filters,
which are attached to the lens of the enlarger, range from blue for high contrast to yellow, which cuts out the blue almost entirely and gives low contrast. In between are eight grades of filters with intermediate degrees of blue and yellow light transmission. All of the filters are made in such a way that neither light nor printing time needs to be varied as filters are changed, except the last two on the blue end. These require approximately twice the time of the others.
In "Varigam," made by Du Pont, chemical science has given the photographer new economy and convenience in printing, and a degree of contrast control more precise than is possible with any combination of commercial papers.
Questions College Men ask about working with Du Pont
What types of training are needed?
The majority of openings for college graduates at Du Pont are in technical work and are usually in chemical, physical, or biological research; chemical, mechanical, civil, electrical, or industrial engineering; medical science; time in other fields, including architecture, ceramics, metallurgy, mining, petroleum and textile engineering, geology, mathematics, accounting, law, economics and journalism. Write for booklet,
"The Du Pont Company and the College Graduates C Nemoura Building, Wilmington 83, Delaware."
BETTER THINGS FOR BETTER LIVING
...THROUGH CHEMISTRY
Move facts about Du Pont - Listen to "Cavalcade of America," Mondays, 7 P.M. to CST on NBC
normal print (center) can be obtained from either a "soft" negative (left) or a "hard"
negative (right), using "Varigam" variable contrast paper.
Sig