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In Memoriam: Susan Grace Jewell; William Paul Yancy; Rollo Harrison Moore, Fern M. Williams, U. A. Hauber, H. S. Longley

Proceedings of the Iowa Academy of Science

No abstract provided.

A Study In Examination Methods, C. J. Lapp

Proceedings of the Iowa Academy of Science

A carefully set-up experiment in methods of conducting examinations in physics is being carried out. All of the variable human factors have been eliminated as far as possible. Students hearing the same lectures, studying the same textbook, and writing the same examinations are pitted against each other: one group using their books and any notes which they care to bring to class with them, the other group using no notes or helps of any kind. The results obtained in this experiment are expected to shed definite light upon the much discussed problem of the aid or hindrance of books during …

College Circular [Catalog] 1925, Iowa State Teachers College

UNI Programs and Courses Catalogs

Table of Contents

Calendar for 1925-26 ... 5
Officers of Administration and Instruction ... 6
Faculty ... 7
General Information ... 42
Residence, Student Health, Assembly ... 42
Expenses and Fees ... 43
Scholarships ... 45
Extension Service ... 45
College Organizations ... 45
Faculty Organizations ... 46
Training in Actual Teaching ... 46
Public Lectures and Entertainments ... 47
Boarding and Lodging ... 47
Employment of Students ... 48
Twelve Weeks Normal Training ... 49
School Credits in Lieu of Certificate Examinations ... 49
Examinations for Teachers Certificates ... 50
Bureau of Recommendations ... 50
Advisers and Amount of …

1925 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.

Index

Proceedings of the Iowa Academy of Science

No abstract provided.

Thermoelectric Effect In Single Crystal Zinc Wires, E. G. Linder

Proceedings of the Iowa Academy of Science

Single crystal zinc wires of any desired orientation may be prepared by the method of Gomperz. The thermo-electric power of such crystals against a standard metal is a function of the orientation of the crystal lattice. The method of growing the crystals is described and data are given on the thermoelectric power against copper of wires of various orientations.

The Action Of An Orifice In An Acoustic Conduit And A Means Of Determing The Effect Of Viscosity, G. W. Stewart

Proceedings of the Iowa Academy of Science

It was shown in a previous communication that the transmission through an acoustic conduit could be computed if the components of the impedance of the branch line were known. In the case of the orifice when viscosity is considered the following are the values of the two components.

Some Soil And Moisture Relationships Of Sweet Gum And River Birch In Southern Maryland, F. B. Trenk

Proceedings of the Iowa Academy of Science

While engaged during the late summer of 1924 in the gathering of data for yield tables in stands of sweet gum (Liquidambar stryaciflua L.) and river birch (Betula nigra L.), in one of the southern counties of Maryland, the attention of the writer was attracted to the striking occurrence of pure stands of these species on adjacent tracts of land, with no apparent cause for the sharp line of demarcation between the two types of forest. Suspecting that some difference in soil structure or soil moisture, or possibly both, might offer an explanation for this rather …

Proceedings Of The Thirty-Ninth Annual Meeting Of The Iowa Academy Of Science, Held At Cedar Falls, May 1-2, 1925: Minutes Of The Meeting; Staff & Committee Reports

Proceedings of the Iowa Academy of Science

No abstract provided.

Quantitative Measurements In The Transmission In Solid Acoustic Wave Filters With Varying Physical Dimensions, H. F. Olson

Proceedings of the Iowa Academy of Science

The object of these experiments was to test the transmission of solid acoustic wave filters with the view to the establishment of empirical formulas to be used in future designs. The length of sections, the conductivity into the branch lines, and the volume of the branch lines were altered in the case of low-frequency-pass-filters. In all cases the variations produced effects that are analogous to those found with acoustic wave filters in fluids. But more than this, so far as a test has been made, the cut-off frequency is in agreement with the Stewart theory for fluids. This means that …

The Occurrence Of Hickories In Iowa In Relation To Soil Types, Fred B. Trenk

Proceedings of the Iowa Academy of Science

The data of ecology reveals a very close relationship between soil types and the species of plant which will be normally found on them. Silviculturists have lately applied methods of ecology quite intensively to a study of the habits and associations of trees, and in these studies the physical and chemical properties of soils occupy a position of prominence. Silviculturists recognize some ten or twelve ecological factors influencing the occurrence and distribution of sylva. These are quite commonly known to foresters as the "Silvicultural Characteristics of Trees." Among the most important of these factors is the one of soil quality.

Certain Relationships Between Physical Conditions And Physiological Vigor, Ava L. Johnson

Proceedings of the Iowa Academy of Science

Data indicative of the physiological vigor expended by students was collected for fifty subjects who were classed in good physical condition on the basis of their physical examinations. The same data were acquired for fifty students whose examinations showed a poorer physical condition.

Officers, Past Presidents, And Members, Iowa Academy Of Science

Proceedings of the Iowa Academy of Science

No abstract provided.

Our Native Plants, L. H. Pammel

Proceedings of the Iowa Academy of Science

The following articles are reprinted from several numbers of The Iowa Farmer and Horticulturist of 1853. This magazine was published in Burlington and Fairfield. The articles are contributed by Dr. L. H. Pammel. In your first number you give directions for preparing the garden, and sowing annual, biennial, and perennial seeds. It may not be generally known by your readers and our citizens that as beautiful plants are native to our woods and prairies, as can be found in any portion of the globe; and that they can be as easily and safely transplanted during the months of April and …

Bacterial Activities In An Orchard Soil, Rudger H. Walker

Proceedings of the Iowa Academy of Science

One of the chief problems with which soils investigators have been concerned for a number of years is that of securing a laboratory test that will serve as an index to the fertility of the soil. In as much as nitrogen is so important an element in crop production it is believed that the power of the micro-organisms to oxidize the nitrogen of the soil would be an indication of the crop producing power of that soil. A very good review of the literature on this subject has been given by Waksman. (1) (2) After a detailed investigation of this …

The Indians Of The Fort Apache Region, Albert B. Reagan

Proceedings of the Iowa Academy of Science

The Fort Apache region is the present home of the White Mountain Apache and San Carlos Indians, a branch of the Athapascan family. They call themselves Dine' or Incle ', meaning "the people." At the present time the White Mountain Apache Indians are under the Fort Apache Agency and the San Carlos Apaches under the San Carlos Agency.

Physical Features Of The Hawaiian Islands, Chester K. Wentworth

Proceedings of the Iowa Academy of Science

The territory of Hawaii consists of eight principal islands of a total area of about 6460 square miles. They are the emergent peaks of a range of volcanic mountains some of which rise to over thirty thousand feet above the floor of the ocean and nearly half as much above the level of the sea. Considered from the ocean floor the Hawaiian range is of about the same length and breadth as the Alps and its summit peaks are nearly twice as high as any in the Alps. Although the area rising to fifteen thousand feet above the general level …

An Attempt To Detect A Predicted Pressure Effect In Gases, G. E. Davis

Proceedings of the Iowa Academy of Science

Fairbourne (Phil. Mag., June, 1922) describes an apparatus which he considers capable of demonstrating the limit of applicability of the second law of thermodynamics, by causing gas molecules to build up a difference of pressure, and consequently to do mechanical work at the expense of their kinetic energy. Articles published later by Witmer and by Fisher (Phil. Mag., 1924) seem to prove that Fairbourne's conclusions are incorrect, at least in part. However they did not consider the effect of adsorption. Experiments were undertaken to test Fairbourne's conclusions experimentally. Thus far the pressure effect which he predicts has not been detected.

Criticism Of A Theory Of Electrical Resistance, John A. Eldridge

Proceedings of the Iowa Academy of Science

The theories which have been devised to account for electrical resistance have had a very meager success. The most serious fault with all such theories is the fact that they give an incorrect temperature coefficient of resistance. As is well known, the resistance of most metals is nearly proportional to the absolute temperature, while most of the theories give a value proportional to the square root of the temperature. The well-known theory of Bridgman proposed several years ago portended to give the proper relationship, but this appears to be due to a mistake in the analysis.

A Study Of An Objective Achievement Examination In Physics, C. J. Lapp

Proceedings of the Iowa Academy of Science

80. A study of an objective achievement

A carefully prepared objective achievement examination in physics was given to a class of freshmen for their final examination at the end of the first semester. To compare with these results, there was available twenty-seven ten-minute, and fifty-minute examinations. The correlation between these two sets of data for about 230 students was extremely high.

Optical Constants Of Molybdenite In The Ultra-Violet, A. W. Meyer

Proceedings of the Iowa Academy of Science

The index of refraction and extinction index of molybdenite (MoS) for a natural cleavage surface have been determined in the ultra-violet by the crystelliptometer. The computed reflectivity is compared with the values directly determined by Coblentz.

The Action Of Cylindrical Tubes In Branch Acoustic Lines, G. W. Stewart

Proceedings of the Iowa Academy of Science

Quincke's tube has long been known. A theoretical and experimental study of its action is herewith reported. Also the formulas for an open tube as well as a closed tube have been derived. The experimental results show unmistakable evidence of the viscosity. The selective property of Quincke's tube is ascertained both experimentally and theoretically for the first time.

The Position Of The Vibrating Source In The Kundt's Tube Experiment, G. W. Stewart

Proceedings of the Iowa Academy of Science

Various textbooks are not in agreement as to whether the vibrating piston is at a node or "near a node." The theory shows that it is strictly at a node. The misstatement in regard to the location of the piston has probably been caused by a misunderstanding of the word "node.” The piston is one-half wave-length from the nearest node and yet it is strictly not a point of rest.

Conditioning The Sexual Instinct In The Albino Rat, H. R. Fossler

Proceedings of the Iowa Academy of Science

No abstract provided.

Sound Localization: A Comparison Of Methods, C. A. Ruckmick

Proceedings of the Iowa Academy of Science

While there has been much experimental investigation f the factors involved in sound localization, few studies have actually tested out the methods used for obtaining the results. The chief concern in recent years has been about the physical criteria which determine localization, but lately also the subjective conditions under which observations have taken place have been discussed and investigated. So theoretically, at least, we are again reminded of the truism that results depend upon the methods used as well as upon the more obvious environmental influences. Facts are often functions of procedures.

Table Of Contents

Proceedings of the Iowa Academy of Science

No abstract provided.

The Alumni News Letter, V8n4, October 1, 1924, Iowa State Teachers College

The Alumni News Letter

Contains news of the College and its alumni.

The Alumni News Letter, V8n1, January 1, 1924, Iowa State Teachers College

The Alumni News Letter

Contains news of the College and its alumni.

The Relative Values Of The Selenium Cell And The Ionization Methods Of Measuring X-Rays In Roentgenotherapy, Arthur W. Erskine, Scott W. Smith Jr.

Proceedings of the Iowa Academy of Science

The two facts which the roentgenologist must know about a beam of x-rays which he is going to use are its penetrating power and its intensity. The penetrating power of a beam of x-rays produced by any set of technique factors can be determined from charts prepared from the experience of many investigators, including the authors, who have produced a set of 160 charts for that purpose. The charts are drawn actual size and show the distribution of x-rays in water with all the variations in technique commonly used in therapy, - water being used as a medium because the …

Is Iowa Getting Wetter Or Drier?, Charles D. Reed

Proceedings of the Iowa Academy of Science

A brief analysis of long period rainfall records in various portions of the state.