Digital Commons Network^™

Note On The Theory Of The Optimum Angle Of A Conical Horn, G. W. Stewart

Proceedings of the Iowa Academy of Science

Hoersch has given a theoretical explanation of the optimum angle of a conical horn experimentally found by the writer. The optimum angle is the one giving the greatest amplification, the horn acting as a receiver. The theory of Hoersch states that the angle is an optimum when the dissipation at the vertex is equal to the dissipation at the open end.

Trapping Birds At Iowa City During 1923, Dayton Stoner

Proceedings of the Iowa Academy of Science

For the past four years I have maintained a bird trapping station in the back yard at my home in Iowa City for the purpose of securing birds for banding. Two government sparrow traps, built after the design and specifications set forth in United States Department of Agriculture Circular 170 (April, 1921), have been in more or less constant operation. Through the agency of these traps, the position of which has been shifted only slightly from time to time, I have taken between April 3, 1923, and January 1, 1923, a total of 112 birds representing six species.

What Is The Absolute Value Of The Prevailing Method Of Selecting Kernels From Ears Of Seed Corn For Testing Purposes?, Winfield Scott

Proceedings of the Iowa Academy of Science

For many years farmers have practiced with more or less care some method of testing seed corn. That this practice has given highly satisfactory results none can deny. The better stands of fields of corn are sufficient proof of the value of testing. But the stands are still far from one hundred per cent, and improvement is desired.

Rainbow And Other Atmospheric Phenomena, F. May Tuttle

Proceedings of the Iowa Academy of Science

Perfectly well behaved rainbows are usually supposed to appear opposite the sun, following a shower; but they sometimes change their minds and appear elsewhere. During the past three years we have been jotting down a few notes and felt they might be of interest to other students of nature's wonderland.

The Operation Of Iowa State Teachers College Extension Summer Schools In 1923, Pearl Giddings Cruise

History of Education Book Gallery

In this day of rapid advancement in every field of activity, the public demands efficiency. Efficiency in any profession requires systematic, intensive training. The foremost educators of the world today are recognizing and trying to meet the situations in the field in its broadest sense. The "test of opportunity" is being withdrawn, and the privileges of the best in our higher institutions are being placed within the reach of all. This advantage is being made possible through a better teachers training and through the services rendered by Extension Divisions and Summer Schools in the Universities and Colleges over the entire …

The Beacon, V1n1, 1924, Iowa State Teachers College

Beacon

The Beacon (v.1, n.1-3, 1924) is an early humorous magazine written and created by students at the Iowa State Teachers College (now the University of Northern Iowa).

The Epizoology Of An Outbreak Of Anthrax In Iowa, Charles D. Rice

Proceedings of the Iowa Academy of Science

On July the twenty-first, 1923, a shipment of cows and calves from Bone Steel, South Dakota arrived in Battle Creek, Iowa. Two cows were dead in one car and were removed by the rendering plant employee, the rest of the herd were taken to The United Farms, two days later three head died and were skinned. The manager refused to allow the carcasses to be fed to the hogs.

Studies On The Commercial Preparation Of Chlorates, H. A. Christopherson

Proceedings of the Iowa Academy of Science

Sodium bicarbonate may be obtained very cheaply from the base of the Solvay tower, after the removal of the ammonium chloride. This process seeks to utilize the bicarbonate by treating it with chlorine to form sodium chlorate. The reaction between chlorine and sodium bi-carbonate at the proper temperature forms sodium chlorate and sodium chloride. The chlorate is recovered from the liquor by virtue of the difference in solubility between sodium chlorate and sodium chloride in the hot and cold. The salt and carbon dioxide are again used in the soda process.

Action Of Natural Alkali Waters On Portland Cement, Geo. W. Burke

Proceedings of the Iowa Academy of Science

Of the salts common to alkali bearing waters those of magnesium are the most active on cement. Magnesium sulphate solution in intimate contact with cement reacts very rapidly with practically all the calcium of the latter producing calcium sulphate and an insoluble compound of magnesium. The reaction results in a material increase in the weight and volume of the cement. Magnesium chloride rapidly reacts with cement replacing practically all the calcium by magnesium. Chemically equivalent amounts of calcium and magnesium are involved in the exchange. Slight decreases in the weight and volume of the cement accompany this reaction. The salts …

The Humboldt Stages Of The Wisconsin Glaciation In Iowa, John E. Smith

Proceedings of the Iowa Academy of Science

The Humboldt stages, like the Algona stages consist of a series of recessional moraines some of which are smaller than others, and some of which are poorly defined and irregular or missing in places. They are somewhat concentrically parallel to each other and are disposed at distances varying from two to eight miles apart along a main axial direction which extends southward near the east branch of the Des Moines river from southern Kossuth county to Humboldt, and along the Des Moines river south of Humboldt to Fort Dodge. Toward the places of union with the Gary moraine both eastward …

Notes On The Geology Of Jackson County, Iowa, H. S. Ladd, Maquoketa Shale

Proceedings of the Iowa Academy of Science

Outcrops of the Maquoketa shale are limited to the eastern portions of Jackson County. Their position is controlled chiefly by the gentle regional dip to the southwest which in the north brings the basal beds and the underlying Galena formation to the surface and to the south in Clinton County causes the uppermost Maquoketa beds to disappear under the Silurian. This dip also allows the Maquoketa outcrops to extend progressively farther upstream in the beds of the northern east-flowing creeks.

Odonata (Dragon-Flies And Damsel-Flies) Of Henry County, Charles Hoffman

Proceedings of the Iowa Academy of Science

During the summer of 1923 and the 1923-24 school year the author has been classifying the Odonata of Henry County. Much of the material had been collected several seasons ago by various students. The collecting was done along the railroad tracks, around meadows and ponds, up creeks and sloughs and along the Skunk River. All specimens studied are in the Iowa Wesleyan College collection. The classifications were verified by Mr. E. B. Williamson of Bluffton, Indiana.

A Ten Year's Phenological Record Of The Spring Flowering Plants Of Henry County, H. E. Jaques

Proceedings of the Iowa Academy of Science

In 1915 a record was started in which the date of the first appearance of flowers of our native and cultivated spring plants was kept. A preliminary report was made in 1918. The record now covers ten years and offers ample opportunity for study. Each spring from fifteen to forty students enrolled in some of the botany classes of Iowa Wesleyan College have worked at collecting and making the record. Collecting has been limited to Henry County and most of the specimens are secured within easy reach of Mount Pleasant. Only plants found growing in open ground out of doors …

The Increase In Potential When Some Reducing Agents Are Added To Certain Oxidants, W. S. Hendrixson

Proceedings of the Iowa Academy of Science

Several years ago Forbes and Bartlett found that ferrous sulfate caused an increase in potential when added to dilute chromate in dilute sulfuric acid, and that chlorides were fatal to this rise. Arsenious acid and ferrocyanide produced much the same effect. Of the oxidizing agents only dichromate showed this rise when treated with reducing agents. So far as known to the writer this subject had received no further systematic study when he took it up near the beginning of the current year. So far as his study has extended, the phenomenon observed by Forbes and Bartlett seems to be by …

Ascent Of Mt. Namosi, Fiji, Waldo S. Glock

Proceedings of the Iowa Academy of Science

This mountain, a little over 3000 feet high, towers above the native village of Namosi in the interior of Viti Levu, Fiji. It has seldom been climbed due to the unusually precipitous sides. A brief account of the ascent together with some notes on the geology.

The Fuana Of The State Quarry Beds, M. A. Stainbrook, H. S. Ladd

Proceedings of the Iowa Academy of Science

The State Quarry beds of Johnson County, Iowa, comprise a very local but decidedly interesting limestone formation of Upper Devonian age. In spite of its restricted distribution the formation has been the subject of some investigation, first because of the abundant fish remains found in certain beds, and secondly because other horizons furnished large blocks suitable for building purposes.

Maxwell's Treatment Of Networks Applied To The Delta Connection Of A Three-Phase Power Source, Alfred W. Meyer

Proceedings of the Iowa Academy of Science

There are two purposes in this paper. The more subordinate one is to give the results of the particular problem. The more important reason for the paper is that it may suggest a means of solution of similar problems. The question arose as to the relation between the electromotive forces of line currents and the electromotive forces of the currents in the delta connected load lines of a three-phase service. There are four possible arrangements. The alternator coils may be in Y or delta connection and with either of these there may be a Y or delta connection between the …

In Memoriam: Archelaus G. Field, Charles Keyes, L. H. Pammel

Proceedings of the Iowa Academy of Science

No abstract provided.

Quercitron Oak And Its Relation To Soils, Raymond J. Becraft

Proceedings of the Iowa Academy of Science

Quercitron oak (Quercus velutina Lam.) is sparsely distributed in Iowa, being reported by Pammel in only nine counties. The only patch known in Story County is this area some three miles northeast of Ames, which is a narrow strip about three miles long. Here its distribution conforms very definitely with the occurrence of an area of Carrington fine sandy loam, which soil was apparently deposited by glacial streams on common glacial till of boulder clay. The type lacks uniformity in depth, much of it showing less than three feet of sand. Where the sub-soil corresponds, it is light grayish-brown …

Certain Features Of The Vegetation In Kansas Sand Hills, Fred W. Emerson

Proceedings of the Iowa Academy of Science

A consideration of some ecological factors influencing the stabilizing of these dune areas located in central Kansas. Heavy grazing interrupts the usual successions of plants, but wherever permitted the permanent climax of bunch-grass usual in the surrounding prairies takes possession and completes stabilization of the sand.

A Note On The Theory Of X-Ray Diffraction In Liquids And Amorphous Solids By Raman And Ramanathan, E. H. Collins

Proceedings of the Iowa Academy of Science

Recently C. V. Raman and K. R. Ramanathan have published a theory which attempts to explain the greatly increased scattering of monochromatic radiation from liquids, which usually occurs at some angle or angles in the angular region 7° to 12° from the x-ray beam. The theory considers that this increased scattering is due to a certain degree of regularity existing between molecules which can be estimated thermodynamically from the compressibility of the fluid. The intensity of the scattered radiation can be computed from a formula which is given. Practically the only experimental verification of his theory is a curve published …

A New Interpolation Formula, John F. Reilly

Proceedings of the Iowa Academy of Science

113. A new interpolation

If we wish to interpolate values of a function between two given values y₁, and y₂, we may employ a polynomial in x1. When the only conditions to be satisfied are that the function take the value y₁ when x=l, and the value y₂ when x=2, the polynomial of minimum degree is of the form a₀+a₁ (x-1). Interpolation by means of this polynomial is that ordinarily employed when using trigonometric and logarithmic tables, and is spoken of as interpolation by first differences. If, however, additional conditions are …

The Bleaching Of Soy Bean Oil With Peat, H. V. Wright, G. A. Peirce

Proceedings of the Iowa Academy of Science

The color in soy bean oil is removed by four or five treatments at 120°C with 10% - 20% of its weight of north Iowa peat or peat ash. The removal of the color is accomplished with fewer treatments by first mixing the oil with an equal volume of solvent naphtha which is distilled off after the bleaching treatment. Exposure of the oil to strong sunlight, or better to ultraviolet rays, assists in removing the last traces of color.

Index

Proceedings of the Iowa Academy of Science

No abstract provided.

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

Proceedings of the Iowa Academy of Science

No abstract provided.

Further Studies Of The Germination Of Woody Plants, L. H. Pammel, C. M. King

Proceedings of the Iowa Academy of Science

Twenty-nine species of seeds were tried out; of these the following germinated: Betula alba var papyrifera, (Marsh) Spach, Betula fontinalis Sarg., Quercus nigra L., Cinnamomum camphora L., Platanus occidentalis L., Physocarpus opulifolius var intermedius (Rydb.) Robinson Pyrus ioensis L., Cercis canadensis L., Amorpha canescens Pursh., Melia Azedarach L., Cissus ampelopsis Pers., Callicarpa americana L., Prunus Cerasus was collected germinating beneath the trees in April. Seeds of all northern species were wintered out-of-doors, lightly covered on the ground, and transferred to greenhouse about March 3.

Some Observations On The Effect Of Iodine Administration Upon Sheep, John M. Evvard, Alvin R. Lamb, W. G. Gaessler

Proceedings of the Iowa Academy of Science

On account of the occasional incidence of goitre and death of lambs produced on the experiment station farm, an experiment on the administration of potassium iodide to the pregnant ewes was carried on in 1917-18. Three lots of four on the same ration were fed from 2 to 15 grains potassium iodide daily. Results on the prevention of goitre in the young were not conclusive, but the passage of the iodine into the milk of the ewes was demonstrated, and pronounced unfavorable results from too large a dose of iodine were obtained, especially in the lots receiving the larger allowances. …

Some Goniatites From The Paleozoic Of Iowa, A. O. Thomas

Proceedings of the Iowa Academy of Science

This type of cephalopod began in the Devonian and became the fore-runner of the Mesozoic ammonites. A few species occur in the Devonian, Mississippian, and Pennsylvanian rocks of Iowa. The relationships and significance of these are pointed out.

Magnetic Properties Of Evaporated Iron Films, A. Sorenson

Proceedings of the Iowa Academy of Science

A study was made of the magnetic properties of iron films deposited on tin foil in a high vacuum by the evaporation method used by J. C. Steinberg. The magnetization curves and hysteresis loops were obtained by an induction method in which the specimen, inserted in a search coil, was placed in a magnetic field of known strength and then suddenly removed from the search coil. The resulting flux was measured by means of a galvanometer which, in order to obtain the required sensitiveness, was kept on open circuit all the time except for an instant while the current passed …

America For Americans, James Hearst

James Hearst Documents

The typescript of the short story America for Americans, published in the American Legion Weekly September 26, 1924.