Science and Mathematics Education Commons^™

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Science Bulletin

A Service Bulletin for Teachers of High School Science.

The Migration Of Birds: Part Ii, O. R. Clark

Science Bulletin

The migration routes are without doubt the result of a long evolution and it is thought that birds may be gradually changing their routes today. A number of factors are involved in determining the routes which different species follow.

Practical Methods Of Producing A Current Of Electricity, L. Begeman

Science Bulletin

Currents of electricity as utilized by the electrical engineer fall naturally into three classes, viz.: those produced by chemical action in batteries; those produced by magnetic induction in dynamos; and those produced by the direct action of heat in thermo-cells.

Editor And Advisory Board

Science Bulletin

A Service Bulletin for Teachers of High School Science.

Scrap Books In Science Teaching, James Kercheval

Science Bulletin

Scrapbooks may become a very valuable connecting link between science in the classroom and science in everyday use.

A Field Trip In General Science, Russia Harris

Science Bulletin

Yesterday my General Science classes visited the water plant to learn how Iowa City secures and prepares its water supply. In preparation for this I made a preliminary visit to the plant and prepared a skeleton outline, as given below, of the information to be gained.

Soap, O. B. Read

Science Bulletin

Soap has been a common and important household article since ancient times. Until within the last fifty years its preparation was largely a home or domestic process, but recently its manufacture has been shifted from home to factory, and soap has become an important industrial product.

My Friend, The Toad, Roy L. Abbott

Science Bulletin

As a boy, I played with a big shepherd dog that had a passionate fondness for toads. He cornered one nearly every day, some place or another, always apprizing me of the fact by loud barking and frantic gesticulations as if he had really found some game worthwhile this time.

Question Box, W. H. Kadesch

Science Bulletin

What is Huyghens's theory of the transmission of light? What objections to this theory have been advanced? How have these been met?

Science Bulletin, Vol.3 No.6, February 1931 [Complete Issue]

Science Bulletin

A Service Bulletin for Teachers of High School Science.

Title Page

Science Bulletin

A Service Bulletin for Teachers of High School Science.

A New Column

Science Bulletin

The suggestion has several times been made that a column be set apart in the Science Bulletin for the exchange of ideas by teachers in the field. The thought is that any specially valuable devices, interesting experiments, or successful projects will be reported there and so be made available to all the science teachers of the state. In conformity with this suggestion such a column will be placed at your disposal each of the remaining issues of the year.

Science In The High School Curriculum, C. L. Jackson

Science Bulletin

“What sciences should be offered in a consolidated high school?” “Our high school school enrollment is about three hundred. What sciences should we include in our course of study?”

For several reasons no dogmatic statement will be made in answer to such questions, but it is hoped that we may be able to offer some suggestions which may help the individual superintendent or principal in deciding the questions for himself.

Makers Of Science, S. F. Hersey

Science Bulletin

In the November number of the Science Bulletin the suggestion was made with reference to science clubs that "Human interest biographies of noted scientists'' would be interesting and helpful. This idea has appealed to the writer as a sound one and has inspired the writing of the present article.

Editor And Advisory Board

Science Bulletin

A Service Bulletin for Teachers of High School Science.

Question Box

Science Bulletin

Can two violins playing the same pitch simultaneously be heard farther than one?

Human Physiology, H. Earl Rath

Science Bulletin

As a small boy I recall sitting near the front of the room in a rural school with my legs swinging vigorously several inches from the floor, and listening while a large group of older boys and girls attempted to recite the names of the bones of the body as well as many other parts. The class appealed to me principally because it seemed to give great pain to the participants, and because it was still a long way off so far as I was concerned. With much less glee do I recall the time a few years later when …

The Nature Of An Electric Current, L. Begeman

Science Bulletin

Electricity at rest upon the surface of a non-conductor or upon the surface of a completely insulated conductor is commonly called a static charge of electricity. As has been explained by the writer in a previous article in the Science Bulletin, a static charge is negative when it consists of an aggregate of electrons and positive when it consists of an aggregate of unneutralized protons.

The Migration Of Birds: Part I, O. R. Clark

Science Bulletin

Among the most characteristic and familiar activities of our birds are their regular seasonal movements between their winter homes and their summer nesting sites.

Science Bulletin, Vol.3 No.5, January 1931 [Complete Issue]

Science Bulletin

A Service Bulletin for Teachers of High School Science.

About Atmospheric Electricity, L. Begeman

Science Bulletin

Our atmosphere is electrified at all times. During the summer the average increase of potential from the earth's surface up is about 100 volts for one meter of ascent. This potential gradient, however, diminishes with increasing altitude until at the height of one mile it is only 25 volts per meter. During the winter the atmosphere is much more in tensely electrified. The average increase of electrical potential near the earth 's surface during this season is as much as 250 volts per meter of ascent.

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Science Bulletin

A Service Bulletin for Teachers of High School Science.

The Planetesimal Hypothesis, E. J. Cable

Science Bulletin

In a former article the writer called attention to the fact that the La Placian hypothesis has been abandoned by scientists because of the serious astronomical, biological, dynamical, and geological difficulties encountered. The Planetesimal or Accretion hypothesis, which has superseded it, is the gift of Doctor T. C. Chamberlin, formerly head of the Department of Geology at the University of Chicago and Director of the United States Geological Survey.

Smoke Makes City Warmer

Science Bulletin

Mr. Fred L. Disterdick, of the U. S. Weather Bureau at Des Moines, has observed surprisingly great differences in temperature between the smoke covered city and the nearby country.

Editor And Advisory Board

Science Bulletin

A Service Bulletin for Teachers of High School Science.

Radio And The Outer Atmosphere

Science Bulletin

In investigating the possibilities of short-wave radio the surprising fact was discovered that although short waves may often be clearly received at distances of thousands of miles from stations with very little power, it is difficult or impossible to detect them at nearby points, 30 to 300 miles away. This can be understood if the upper atmosphere acts like a reflector.

Universe May Not Be Running Down

Science Bulletin

The Sun by radiation is losing energy at a tremendous rate. The Earth receives about one two thousand millionth part of this, and other planets, satellites and asteroids their tiny share. The rest travels out into the depths of space, presumably to be lost forever so far as the solar system is concerned.

On Meeting With A Fox, Roy L. Abbott

Science Bulletin

It is rarely that one sees a wild animal at its best. As a hunter, I have shot many beautiful birds and small mammals, but on retrieving them, in spite of my elation at their capture, I have always had the haunting feeling that the dead thing in my hand was not the creature at which I had aimed. As an anatomist, I have dissected scores of animals, but always do I realize that the stiff, cold thing under my scalpel is not quite the thing it was when alive.

Plant Disease Control, C. W. Lantz

Science Bulletin

In the November issue of the Bulletin some idea of the crop losses due to plant diseases was given. Obviously the farmer should be concerned in preventing these losses if he is to profit most from his labor. The control of plant disease lies in prevention rather than cure. In most cases, the individual plant is not of sufficient value to warrant an attempt to cure it. The exceptions would be in those cases where a valuable individual plant such as a shade tree becomes diseased and it would be desirable to save it.

Question Box, W. H. Kadesch, O. R. Clark, Winfield Scott

Science Bulletin

Question: Wood is opaque to light but is easily penetrated by X rays. The latter, however, are stopped by some kinds of clear glass. Does this not show that light and X rays are of different nature?

Is it desirable to study the theory of evolution in connection with a high school course in Botany? If so, to what extent?

What is the purpose of crop rotation?