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The Lithogenesis Of The Sediments, Francis M. Van Tuyl

Proceedings of the Iowa Academy of Science

There are few lines of investigation in geology which promise more fruitful returns than the lithogenesis of the sediments. The sedimentary rocks have from the first been sadly neglected although the igneous and metamorphic groups have been systematically and more or less intensively studied both in the field and in the laboratory. Even the megascopic characters of the sediments have for the most part been indefinitely and vaguely described and petrographic examinations have until recently rarely been made. Descriptive terms have been indiscriminately used and such important features as mud cracks and many others equally as significant have in many …

1916 Courant, Iowa State Teachers College High School

Malcolm Price Laboratory School Yearbooks

The student yearbook of the Teachers College High School (later the Northern University High School, part of the Malcolm Price Laboratory School of the University of Northern Iowa).

Proceedings Of The Thirty-First Annual Session (Of The Iowa Academy Of Science), Held In Des Moines, April 28 And 29, 1916: Minutes Of The Meeting; Staff & Committee Reports

Proceedings of the Iowa Academy of Science

No abstract provided.

On The Variation In The Reflecting Power Of Isolated Crystals Of Selenium And Of Tellurium With A Variation In The Azimuth Of The Incident Plane Polarized Light, L. P. Sieg

Proceedings of the Iowa Academy of Science

The reflecting power of a surface is defined as the ratio of the intensity of the light reflected at perpendicular incidence to the intensity of the incident light. There are two ways of determining the reflecting power of a metallic surface. One is by a direct, or photometric (dioptric) method. The other is by an indirect (katoptric) method.

The Tungsten X-Ray Spectrum, Elmer Dershem

Proceedings of the Iowa Academy of Science

Some work has recently been done in this laboratory in the analysis of the molecular arrangement in certain crystals by means of the reflection of X-rays from these crystals. To carry out this work it was first necessary to determine the wave lengths of the characteristic lines of the tungsten X-ray spectrum because tungsten is the material of the anticathode of the Coolidge X-ray tube, the most satisfactory tube for this kind of work.

Bibliography Of Literature Bearing On The Light-Sensitiveness Of Selenium, F. C. Brown

Proceedings of the Iowa Academy of Science

A bibliography of literature bearing on the light-sensitiveness of selenium.

Why Hot Water Pipes In Household Plumbing Burst More Frequently Than Cold Water Pipes, F. C. Brown, Waldemar Noll

Proceedings of the Iowa Academy of Science

Plumbers often notice that the hot water pipes in a plumbing system that lead to the bathroom or kitchen burst more frequently than the pipes carrying cold water. It is said that the ratio is at least four to one. The "Cold Water" usually freezes so as to lessen the flow of water in the pipes, or to stop the flow altogether, but the freezing seldom bursts the pipes unless the temperature is very low.

Certain Elastic Properties Of Phosphor-Bronze Wires, A. J. Oehler

Proceedings of the Iowa Academy of Science

The work by Guthe, Guthe and Sieg, and Sieg, on platinumiridium wires when used as suspensions for torsion pendulums, showed some remarkable elastic properties of that alloy. The principal one of these was the variation of the period with the amplitude of vibration. It was these studies that made it seem very desirable to test other alloys commonly used for suspensions, by a similar method.

Quarterly News Letter To The Alumni, September 1, 1915, Iowa State Teachers College

Quarterly News Letter to the Alumni

A quarterly publication to keep graduates of the Iowa State Teachers College informed on the happenings on campus and of fellow alumni.

Courses Of Study And Program Of Recitations, 1915-1916, Iowa State Teachers College

UNI Schedule of Classes

A listing and schedule of the courses being taught as well as policies and procedures concerning attending classes at the Iowa State Teachers College.

Quarterly News Letter To The Alumni, July 1, 1915, Iowa State Teachers College

Quarterly News Letter to the Alumni

A quarterly publication to keep graduates of the Iowa State Teachers College informed on the happenings on campus and of fellow alumni.

College Catalog And Circular 1915, Iowa State Teachers College

UNI Programs and Courses Catalogs

Table of Contents:

Calendar for 1915-1916 ... 6
Officers of Administration ... 7
Officers of Instruction ... 7
Faculty Committees 1915-1916 ... 16
Plan of Organization ... 19
General Regulations ... 19
Faculty Regulations ... 21
Order and Deportment ... 21
Credits and Scheduling ... 21
Extension Service ... 22
Exchange of Students ... 23
Expenses and Fees ... 23
College Organizations ... 25
Training in Actual Teaching ... 26
Public Lectures and Entertainments ... 26
Boarding and Lodging ... 28
Requirements for Admission ... 30
The College Degree Courses ... 32
Department Courses ... 40
The Diploma Courses ... …

Summer Term, Nineteenth Annual Session, 1915, Iowa State Teachers College

UNI Schedule of Classes

A listing and schedule of the courses being taught as well as policies and procedures concerning attending classes at the Iowa State Teachers College.

An Attempt To Detect A Change In The Heat Conductivity Of A Selenium Crystal With A Change In The Illumination, L. P. Sieg

Proceedings of the Iowa Academy of Science

Modern electron theories indicate that the electrical and thermal conductivities of good conductors should stand in very close agreement with each other. One of the first theoretical developments was that of Drude. While perhaps, it will not be necessary to rewrite his formula here, we can at least state that he determined on purely theoretical grounds that the ratio of the thermal to the electrical conductivities for good conductors should he a function only of the absolute temperature. This theoretical formula has had excellent verification in the work of Jaeger and Disselhorst, who worked with most of the common metals. …

The Effect Of Change Of Lamp Voltage On Vision, Wm. Kunerth

Proceedings of the Iowa Academy of Science

If must be apparent to anyone who has tried to read or study by the light of an incandescent lamp that there is occasionally such a great change in the impressed voltage as to be decidedly objectionable. These changes may be due to a turning on or off of a great number of lamps at the same instant, or to the closing or opening of a circuit containing a relatively big power consuming agent.

1915 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.

Notes On Certain Elastic Peculiarities Of Phosphor Bronze Wires, L. P. Sieg, A. J. Oehler

Proceedings of the Iowa Academy of Science

Some previous work by one of the authors with wires of an alloy of platinum-iridium, portions of which work were published in these Proceedings, indicated that when the wires were used as suspensions for torsion pendulums, the relations between the period of vibration and the amplitude were exceedingly complicated. The effect of drawing these wires was dealt with in another paper. In all these papers referred to, the statement was made that similar tests should be applied to some of the more common wires in the hope of finding similar, even though smaller effects. Through press of work these experiments …

A Simple Device For Demonstrating The Tempered Scale, L. B. Spinney

Proceedings of the Iowa Academy of Science

The diatomic scale consisting of a succession of eight tones and containing three intervals known as ''major second intervals,” two known as ''minor second intervals'' and two "half-tones," is not adapted to musical instruments of "fixed pitch'' (e.g. the piano, harp, etc.) for the reason that it does not without a multiplicity of keys (strings) allow of transposition or change of keys.

An Improved Heating Apparatus For Maintaining Constant Temperatures In Work With Polarimeters And Refactometers, J. N. Pearce

Proceedings of the Iowa Academy of Science

In the course of some work upon the effect of temperature upon the specific rotation of optically active substances in solution, it was found necessary to maintain constant temperatures over long periods of time. The conditions demanded that the heating apparatus be one which is simple and convenient and at the same time one which permits the easy reproduction of any given temperature.

Illustrated Review Showing Development Of The State Of Iowa, Earl J. Robinson & Co.

Iowa Book Gallery

Descriptive text covering counties, cities and villages based on the latest official sources, with special articles by well known state authorities. Newly engraved charts showing principal automobile roads, including the Lincoln highway and its feeders, detailed railroad maps of every state with complete index, also maps of foreign countries.

Proceedings Of The Twenty-Ninth Annual Session Of The Iowa Academy Of Science: Staff & Committee Reports; Program

Proceedings of the Iowa Academy of Science

No abstract provided.

On The Lymphatic System Of The Common Rat, Thesle T. Job.

Proceedings of the Iowa Academy of Science

From fifty injected specimens, the gross anatomy of the Common Rat has been studied and outlined. The results of the work have further proven the studies of McClure and Silvester on the Lymphatico-venous communications in the Jugulo-subclavian district, and of Silvester on the renal vein communications, and have established two additional communications, the portal vein connection and the ilio-lumbar vein connection. The main circulation and disposition of the lymphatic system has been determined and the need of further knowledge concerning the histology of the lymph nodes, of which there appear to be two types, is pointed out.

Flora Of The East Slope Of The Cascade Mountains, In Crook County, Oregon, Morton E. Peck

Proceedings of the Iowa Academy of Science

In the latter part of June, 1914, the writer joined a company of biological investigators and collectors, working under the general direction of Mr. Vernon Bailey, field naturalist of the U. S. Biological Survey, on a trip across the Cascade Mountains, by way of the McKenzie Pass. The purpose of the expedition was to secure certain zoological and botanical data and specimens of the animal and plant life of the region, with a view to determining the life zones of this section of Oregon, as well as to add material to the collections of the several institutions represented by the …

Macroscopic Fuana Of A Small Brook, D. M. Brumfiel

Proceedings of the Iowa Academy of Science

The brief paper here presented is but the first of a series of studies which the writer proposes to work out concerning the ecological relations of the animal life of Johnson County. Johnson County has been chosen as the field for observations for several reasons, among which are its availability from Iowa City and the University buildings as a center, its wealth of diversified habitats, and the most excellent work already done by Professor Bohumil Shimek in the field of plant ecology, upon which all studies of animal ecology depend, as all animals ultimately depend upon plants for food.

The Theory Of Binaural Beats - An Experimental Contribution, G. W. Stewart, Harold Stiles

Proceedings of the Iowa Academy of Science

The experiments here reported were performed in order to secure evidence concerning the cause of the additional maxima which occur in binaural heats. (See G. W. Stewart, Physical Review, Series 2, 3, p. 146, 1914, for a description of the phenomena.) These additional maxima occur at certain phase differences, and the change in these phase differences should depend upon the frequency of the tones, but not upon the frequency of the beats. If the additional maxima are caused by interaural conduction then, as it can be shown, the phase differences should vary as the frequencies. In the accompanying curve the …

A Convenient Standard Cell, Dieu Ung Huong, J. N. Pearce

Proceedings of the Iowa Academy of Science

Until recently both the Clark and the Weston cells have served as standard sources of electromotive force. Both of these consist of an amalgam of a metal as the anode covered by a saturated solution of the sulphate of the metal and this in conjunction with mercury and mercurous sulphate which serves as the cathode.

Some Well Known Building Materials, Nicholas Knight

Proceedings of the Iowa Academy of Science

A specimen of the rock of which the Houses of Parliament, London, are constructed was sent us some months ago, for analysis, by the Honorable John Burns, member of the British Cabinet. We had read in one of the popular magazines that the rock in the Parliament buildings is quite rapidly weathering and crumbling. We desired to make the chemical analysis to ascertain, if possible, the reason for the decay. The rock has a buff color when first quarried or on a fresh fracture, but it is darkened by the London smoke except in some of the protected angles. The …

The Loess Of Péczel, Hungary, B. Shimek

Proceedings of the Iowa Academy of Science

Péczel is located a half-hour's ride by rail east of Budapest. Extensive exposures have been made east of the town in a brickyard lying just north of the railway. For two hundred yards interrupted exposures face the railway. Eastward the line of exposures sweeps around the end of a ridge, and is continued northward, on the north side of a narrow valley, along the side of an upland which borders another valley extending in a northerly direction. The entire region lies south of the southern boundary of the European drift sheets.

Foundation Of Exact Geologic Correlation, Charles Keyes

Proceedings of the Iowa Academy of Science

In the last generation or two there appears to have been little advancement made along lines of general geologic correlation. Two controlling reasons stand out prominently. On account of the fact that the criterion of fossils is so largely misused and is so generally unchecked by other critical criteria it is continually losing much of its former precedence. The adoption of the lithologic formation as the cartographic unit is also almost a complete failure for the reason that no account is taken of the change, replacement and effacement of its essential characters from place to place. All this confusion gives …

A Resonance Method For Measuring The Phase Difference Of Condensers, H. L. Dodge

Proceedings of the Iowa Academy of Science

It is a well-known fact that when an alternating electromotive force is impressed upon a condenser the resulting current does not lead the electromotive force by the theoretical ninety degrees. This is particularly noticeable in the case of paper condensers of the telephone type so often used in laboratories for the study of the alternating current circuit. When an attempt is made to interpret such experiments by graphic methods it is sometimes found that the power factor of the condensers is so great that it must be taken into account. The power factor angle or the angle by which the …