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Use Of Galena As A Terranal Title In Iowa, Charles Keyes

Proceedings of the Iowa Academy of Science

In recapitulation: Taxonomic analysis of the problem of the Galena limestone shows that, (1) In concept here is a last, lingering relict of Wernerian geology of the Eighteenth century; (2) Galena limestone is not a good geological formation, but a lithologic facies of another; (3) Its title is untutored miners' parlance instead of a scientific derivation; (4) Its name is not taken from some geographic one, but town of this name takes title from the rock; (5) It is not the equivalent of the Carbonic Galeniferous limestone of England as so long regarded ; (6) United to the Blue limestone …

Paschen-Back Effect Of Hyperfine Structure And Polarization Of Resonance Radiation: Cadmium (61p1-51s1), N. P. Heydenburg

Proceedings of the Iowa Academy of Science

Because of the Paschen-Back effect of the hyperfine structure of the odd isotopes, the polarization of cadmium λ2288A resonance radiation excited by plane polarized incident light changes from 76.7 per cent in zero field to 100 per cent in a strong field parallel to the electric vector of the exciting light.

The Measurement Of Psychophysical Functions Characteristic Of Extreme Degrees Of Artistic Capacity, Carolyn E. Tiebout

Proceedings of the Iowa Academy of Science

Through extended laboratory measurements an attempt has been made to determine the psycho-physical traits characteristic of artistic as opposed to non-artistic children. Results indicate that while differences do not exist in motility, motor accuracy, and color sensitivity, there are significant differences in imagination, memory for visual stimuli, completeness of observation, and originality of line drawing.

Germination Of Corn In The Field As Affected By Soil And Air Temperature, J. M. Aikman

Proceedings of the Iowa Academy of Science

The corn was planted at weekly intervals from April 15 to May 27. A continuous record of soil and air temperature was obtained from a soil-air thermograph set up in the plot. Tabulations were made of maxima, minima and average weekly soil and air temperatures for the germination period of each planting. The length of the period necessary for 85 per cent emergence for the seven plantings was 21, 22, 18, 18, 16, 15 and 11 days respectively. Length of germination period shows a higher correlation with average soil temperature than with air temperature. Correlation with the total heat units …

1933 Old Gold, Iowa State Teachers College

UNI Yearbooks

The student yearbook of the Iowa State Teachers College, later known as the University of Northern Iowa.

Contrasted Till Reliefs, Charles Keyes

Proceedings of the Iowa Academy of Science

The topography and relative amount of erosion which till-sheets suffer is sometimes used as a measure of identification and correlation. The method, however, is at best, only qualitative in character, and personal equation enters altogether too largely to make the test generally serviceable. Nevertheless, recently, it becomes possible to devise a methodical scheme of comparing tills, or of determining their ages based upon cosmical data, and relief expression assumes new interest and quantitative character. Thus, contrasted relief expression of the Ashuawa till, the Des Moines lobe of the Wisconsin group of glaciations the till derived from the Keewatin center of …

Iowa Stratigraphy On Methodical Scheme, Charles Keyes

Proceedings of the Iowa Academy of Science

No science, perhaps, is so backward as Geology in the genetic plan of its classification, its taxonomic nomenclature, or its methods of terranal correlation. Although in Europe considerable progress is made in methodical systems of geological arrangement and terminology, in this country laissez faire practice continues to prevail to such appalling extent that clear classificatory concept and perspicacious correlation are almost impossible even over moderate regional areas. How Iowa might look in methodical scheme of geological classification is presented in diagram and in tabular form. The local outlines are also developed into world-wide uniformity.

An Iowa Journal Of Mathematics, Gertrude A. Herr

Proceedings of the Iowa Academy of Science

The aim of this paper is to call the attention of Iowa scientists to the fact that in the development of mathematical periodicals Iowa has played a significant part. From January, 1874 to November, 1883 The Analyst, a Journal of Pure and Applied Mathematics was published in Des Moines by Joel E. Hendricks, a self-taught mathematician. This journal, started thirteen years after the last issue of the Mathematical Monthly of Boston (1859-1861), had the distinction of surviving longer than any previously published journal of its kind in the United States.

The Spectral Distribution Of Erythemal Effectiveness Of Ultraviolet Radiation, George E. Davis

Proceedings of the Iowa Academy of Science

During the last twelve years several determinations of the distribution of erythemal effectiveness of radiation in the spectral region extending from wave-length 2400 or 2500 A. to about 3400 A. have indicated maximal effectiveness at 2967 A. However, all the investigators using monochromatic radiation employed the mercury vapor arc as source, so that their observations necessarily were limited to those wave-lengths represented by fairly intense lines of the mercury arc spectrum. These lines are not close enough together to allow accurate determination of the curve of erythemal effectiveness. Maximal effectiveness was assumed to be at 2967 A., its spectral position …

Suggestion As To Structure In Ionic Solutions, G. W. Stewart

Proceedings of the Iowa Academy of Science

The Debye-Hückel theory gives about each ion an atmosphere of ions which is preponderately of the opposite sign. While this theory is the best quantitative theory at the present time, yet it neither explains nor discusses the manner in which both the association of ions and of ions with solvent molecules can occur. But in x-ray diffraction in several normal alcohol solutions with lithium chloride as a solute, it has been found that the quasi-structure of the liquids is modified in precisely the manner one would expect if these liquids can be regarded a mixture of liquified ionic crystals of …

Current Views Concerning The Liquid State, Ross D. Spangler

Proceedings of the Iowa Academy of Science

Investigation of ether in the region of the critical point by the x-ray diffraction methods leads to a new conception of the liquid state. A review is made of authoritative views on the subject and these views discussed in the light of new evidence obtained by x-ray methods. It appears that existing definitions of the liquid state are not adequate and should be supplanted by ones more in conformity with the facts.

The Effect Of Cathode Rays On Metal Surfaces, Elizabeth Wilcox

Proceedings of the Iowa Academy of Science

Metal surfaces which have been bombarded with cathode rays and those which have not been so bombarded, react differentially toward chemical vapors. Surfaces which have been rayed through a stencil and developed in certain vapors, reveal the image of the stencil pattern. It was desired to protect the unrayed areas with an inactive and nonconducting coating. The rayed areas should then acquire a deposit when the specimen is electroplated. This was best accomplished by development in the absence of air, with ionized organic vapors. Attempts were also made to raise the surface of the rayed regions directly. Preliminary experiments indicate …

The Effect Of Low Voltage Cathode Rays On Photographic Film, A. R. Brown

Proceedings of the Iowa Academy of Science

Experiments were conducted to record cathode rays of low voltage on a film. This was carried out by means of a specially constructed vacuum tube, the film passing over a slit in the anode which formed part of the outside of the tube. It was hoped that this would provide a means of sound recording when the tube was properly modulated. Problems concerning the making of the slit, the maintenance of a suitable vacuum, a filament which would give a good emission at working pressure, and the proper designs for the tube elements were considered.

Results Of The First Cooperative College Physics Examination Sponsored By The American Association Of Physics Teachers, C.J. Lapp

Proceedings of the Iowa Academy of Science

The Committee on College Examinations for the American Association of Physics Teachers, working in conjunction with the Cooperative Test Service, which is sponsored by the American Council of Education, have prepared two forms of an objective examination over mechanics, sound and wave motion. This examination was given to the students in fifteen cooperating colleges at the end of the first semester; involving more than 1000 students. The results of this cooperative examination will be discussed. A second cooperative examination is now being prepared by the Committee for use at the end of the second semester.

Piezoelectric Measurements Of Crystals With A High Sensitivity Lever, George Fink

Proceedings of the Iowa Academy of Science

For the measurement of piezoelectric deformations of quartz and tourmaline plates an amplifying lever system was designed and built. A lever ratio of 1864 to 1 combined with an optical interference method of measuring the motion of the long end of the lever makes it possible to detect a displacement of the short end of only 0.15 Angström unit. The changes in thickness of quartz plates about two mm thick were measured with potential differences up to 500 volts between the electrodes on the faces of the plates. The piezoelectric constant of quartz found by this method using the converse …

An Apparatus For The Demonstration Of Malus Law, Using The Photronic Cell, Robert G. Wilson

Proceedings of the Iowa Academy of Science

This apparatus is a further development of that designed by Dr. Weld of Coe College. The principal change is that of using a photronic cell to measure the light intensity. The apparatus was designed especially for use in advanced optics courses. It can be operated easily by an advanced student and gives very accurate results with a minimum of simple adjustment. The photronic cell provides a quick, direct method of measuring the light. The student gets an introduction to photo-electricity through its use in the experiment. The apparatus provides a practical method of demonstrating the action of any kind of …

Mosaic Zinc Crystals, E. P. T. Tyndall, H. K. Schilling

Proceedings of the Iowa Academy of Science

Crystals of a distinctly mosaic type (that is, a group of polycrystals with almost identical orientations) have been grown with great frequency during the last two years. Some types of these will be described and their bearing on the growth of single crystals by various methods will be discussed.

Elasticity Of Zinc Crystals, A. W. Hanson

Proceedings of the Iowa Academy of Science

Improvements have been made in the apparatus for the determination of the elastic constants so that the results on different specimens are in far better agreement than when previously reported (Iowa Academy, 1932). Incomplete tests seem to show that crystals with distinct mosaic structure differ only slightly, if at all, in elastic properties from true single crystals.

Characteristics Of Mercury Vapor Pumps, L. E. Pinney

Proceedings of the Iowa Academy of Science

Curves showing relation between fore pressure and flow of mercury vapor required to produce a definite degree of exhaustion have been obtained for a mercury vapor pump. The pump is built according to definite specifications. Its general use will be discussed.

A New Electrical Method Of Determining Specific Heats, Earl C. Mccracken

Proceedings of the Iowa Academy of Science

89. A new electrical method

In this report is described a method of procuring the specific heats of materials by comparing the rate of heating of water by direct passage of current through it to the rate of heating when the water contains small particles of the material. By this method one may determine accurately the specific heat of a substance over various temperature ranges and while the temperature is rising. It is also especially applicable where the specific heat cannot be obtained accurately by the method of mixtures because of the nature of the material.

The Reading Difficulty Of Parent Education Materials, R. H. Ojemann

Proceedings of the Iowa Academy of Science

It is not necessary to emphasize the fact that reading plays an important part in the education of parents. A more significant problem is that of discovering the characteristics of materials that fall at different levels of difficulty. A solution of this problem would make possible a more effective selection and preparation of materials suitable to the widely differing reading abilities that one finds among adults. The purpose of this investigation is to determine the factors that are associated with difficulty and to learn what the characteristics of materials are at the various levels. To carry out this study the …

Are The Response Latencies Of The Achilles And Patellar Reflex Responses As Recorded By The Action Current And Muscles Thickening Techniques Comparable?, Clarence L. Nystrom

Proceedings of the Iowa Academy of Science

Two techniques for the measurement of the latent times of the Achilles and the patellar tendon reflexes have become more or less standardized in recent years. These are: (1) the recording of the currents of action from the executant muscle; and (2) the recording of the thickening of the muscle itself.

The Role Of The Concept In Reading Ability, Paul Murphy

Proceedings of the Iowa Academy of Science

One of the most fruitful fields of research in the psychology of reading has been that concerned with the analysis of specific psychological functions involved in reading. A cursory perusal of the literature, however, reveals the fact that the great majority of such investigations have dealt with the mechanical phases of the process, such as eye-movements, rate of reading, typographical factors, and related functions, leaving more or less untouched such processes as reasoning, conception, understanding, and the like. It was the hope of shedding some light on some of these untouched areas that the present investigation was undertaken.

The Effect Of Size Of Peg And Form Boards Upon The Performance Scores Of Young Children, Thomas F. Vance

Proceedings of the Iowa Academy of Science

Sylvester, in 1913, characterized the form board test as one that "appeals to the child's interest, affording him a short and fascinating task which calls for his best effort and helps to free him from the fear and self-consciousness which often interfere seriously in a mental examination." The inclusion of the form board test in certain well-known scales and its serving as the basis of a number of extensive studies bear testimony to the truth of Sylvester's evaluation. Further study of the form-board may thus be justified on the basis that a still greater refinement in technique may be attainable.

Class Participation As A Class Room Activity, J. E. Evans

Proceedings of the Iowa Academy of Science

This scheme of teaching attempts to make the student the most active person in the class room. The students in this course were seniors and graduate students.

The Psychology Of A Psychologist, Christian A. Ruckmick

Proceedings of the Iowa Academy of Science

In the last analysis, psychology is to be defined in terms of the professional activities of a psychologist. As in the case of other sciences, psychology may also be delimited in terms of the things it deals with. All sciences, however, have become so broad in their scope that they overlap, and the classification as regards their particular fields and their devotees can only be approximately circumscribed. To leave experience or its historical equivalent, mental process and function, out of the picture would be to resign from the commission originally given to psychology. For this reason the writer cannot agree …

Radio Broadcasting Vs. Lecturing In Psychology: Preliminary Investigation, Harold V. Gaskill

Proceedings of the Iowa Academy of Science

Two twenty-four minute talks on Psychology and Athletics were broadcast, and, given directly to groups of college students - all students in the experimenter's classes in psychology. Objective examinations on the talks were constructed, and subsequently given to the listeners.

An Achievement Test Of Dynamic Control In Music, O. Irving Jacobsen

Proceedings of the Iowa Academy of Science

The use of the power level indicator with readings in decibels was standardized. Musically trained observers were tested on their respective instruments, untrained observers by voice. Their achievement test was compared with their motor capacity and sensory capacity tests. Conclusions were drawn in regard to the effect of pitch level, intensity level, instruments, and training.

Substitution Of Time For Stress In Performance Of Measure Accent In Piano Music, Mack T. Henderson

Proceedings of the Iowa Academy of Science

Very definite time organizations occur within the measure of a given musical selection (3/4 time) apparently for the purpose of measure accent. Successive changes in stress do not account for measure accent nor do they operate with time changes to enhance the accent. Measurements are based upon recordings on the Iowa Piano Camera of the chorale section of Chopin's Nocturne, No. 6 (Opus 15, No. 3).

Pernicious Anemia: A Study In Psychodietetics, M. F. Fritz

Proceedings of the Iowa Academy of Science

Psychodietetics deals with the relationship between diet and mental behavior. A number of diseases now definitely attributed to dietary defects or deficiencies cause mental symptoms. An outstanding example of this is pernicious anemia. Mental symptoms were mentioned by Addison who first described the malady in 1855. However, its psychological aspects have frequently been overlooked, even by physicians. There are important legal implications, e.g. wills. Description of blood findings and mental disorders. Importance of the fact that the mental symptoms may precede the typical blood picture. Description of nervous involvement. Treatment by dietary methods, liver, hog's stomach, etc. Prognosis, particularly with …