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Issue 9 | Dec 1956 | pp. 595-636

Issue 8 | Nov 1956 | pp. 543-594

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Issue 5 | May 1956 | pp. 303-420

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Volume 1

Select this Article		Infrared Radiation in the Atmosphere Gilbert N. Plass American Journal of Physics -- May 1956 -- Volume 24, Issue 5, pp. 303 Online Publication Date: Jul 2005 Full Text: \| Download PDF
	+ -	Show Abstract The infrared radiation flux in the atmosphere is determined by the distribution of three gases—water vapor, carbon dioxide, and ozone. The general equations for the transfer of radiation in a gas are derived. These equations are solved for four simple model atmospheres that illustrate various features of the more complicated results for the earth's atmosphere. The atmospheric infrared radiation flux can be calculated from laboratory absorption measurements. The results of such calculations are discussed in detail for the frequency ranges that are influenced by the carbon dioxide and ozone bands.

Select this Article		Where Do We Get the Teachers? David D. Henry American Journal of Physics -- May 1956 -- Volume 24, Issue 5, pp. 322 Online Publication Date: Jul 2005 Full Text: \| Download PDF
	+ -	Show Abstract Estimates of the requirements for new teaching personnel in colleges and universities indicate that a serious shortage is impending within the decade 1960–1969. Measures currently being practiced are inadequate to fill the need. A more active recruitment and training program on the part of universities is advocated. The obligation of industry to avoid undermining educational programs by recruiting staff members away from colleges and universities is emphasized.

Select this Article		Summer Institutes for High School Science Teachers Robert L. Weber American Journal of Physics -- May 1956 -- Volume 24, Issue 5, pp. 328 Online Publication Date: Jul 2005 Full Text: \| Download PDF
	+ -	Show Abstract Increasing college enrollments, and the needs of both industry and the national welfare for capable, technically trained personnel emphasize the desirability of special supplemental programs for increasing the competence of high school teachers of science and mathematics. The growth of interest in summer science institutes, their financial support, and their effectiveness are discussed.

Select this Article		The Need for Trained Intelligence Glenn W. Giddings American Journal of Physics -- May 1956 -- Volume 24, Issue 5, pp. 334 Online Publication Date: Jul 2005 Full Text: \| Download PDF
	+ -	Show Abstract Three aspects of the need for highly intelligent trained people are discussed: the need for more understanding of some of the problems of education, the need for a more enlightened attitude on the part of industry in using trained intelligence, and the need for intelligent acceptance of our social responsibilities.

Select this Article		Johannes Kepler's Universe: Its Physics and Metaphysics Gerald Holton American Journal of Physics -- May 1956 -- Volume 24, Issue 5, pp. 340 Online Publication Date: Jul 2005 Full Text: \| Download PDF
	+ -	Show Abstract Though much neglected and misunderstood, Kepler was the first to attempt the detailed construction of a clockwork-like world picture operating on a single physical force law. An analysis of the eventual failure of Kepler's attempt gives us a clue to the central enigma in his writings: His heliocentric conception is a superposition of three aspects—physical, mathematical, and metaphysical. Kepler's free choice among these, which is the source both of his strength and of his apparent inconsistencies, results from his indecision between two different criteria of reality; according to one, the real world is the world of phenomena explainable by mechanical principles, and according to the other it is the world of harmonious regularity which man can discern by virtue of a direct connection existing between his mind and the Deity.

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May 1956

Volume 24, Issue 5, pp. 303-420

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Select this Article		A Study of Postulates: The “Thermodynamic” Derivation of the Adiabatic Gas Law D. Shanks American Journal of Physics -- May 1956 -- Volume 24, Issue 5, pp. 352 Online Publication Date: Jul 2005 Full Text: \| Download PDF
	+ -	Show Abstract The adiabatic gas law, pv^γ = const, is usually derived in thermodynamic textbooks as if it were a consequence of the first law of thermodynamics. It is shown here that the first law, and other assumptions made, are really irrelevant. These “thermodynamic” derivations are then analyzed in order to clarify the nature of the irrelevancies.

Select this Article		Measurement of Velocity of Sound in Gases Dennison Bancroft American Journal of Physics -- May 1956 -- Volume 24, Issue 5, pp. 355 \| Cited 3 times Online Publication Date: Jul 2005 Full Text: \| Download PDF
	+ -	Show Abstract A method of determining the velocity of sound by observing the frequencies of radial oscillation of a gas confined in a spherical cavity is described. The accuracy appears to be comparable with that of the best methods available to date. A few preliminary results are quoted for argon, oxygen, and CO₂. The possibility of utilizing the measurements for determination of the absolute temperature of the ice point is discussed.

Select this Article		Network Theorems Applied to a Determination of the Resistance and Sensitivity of a Galvanometer G. C. McCormick American Journal of Physics -- May 1956 -- Volume 24, Issue 5, pp. 359 Online Publication Date: Jul 2005 Full Text: \| Download PDF
	+ -	Show Abstract Deflection methods used in laboratory courses for determining the resistance and sensitivity of a galvanometer normally involve errors due to contact potentials. Considerations underlying the avoidance of such errors are reviewed. A method of measurement using Thévenin's and other network theorems is presented. Resistance and sensitivity measurements over the complete scale range are readily made to within 0.15%.

Select this Article		X-Ray Equipment for the Atomic Physics Laboratory Wallace A. Hilton and Glen T. Clayton American Journal of Physics -- May 1956 -- Volume 24, Issue 5, pp. 362 Online Publication Date: Jul 2005 Full Text: \| Download PDF
	+ -	Show Abstract Equipment using obsolete medical x-ray machines to perform the basic x-ray absorption and diffraction experiments for the undergraduate atomic physics laboratory is described.

Select this Article		Reproductions of Prints, Drawings, and Paintings of Interest in the History of Physics. 75. Mechanical Clocks in Sixteenth-Century Art E. C. Watson American Journal of Physics -- May 1956 -- Volume 24, Issue 5, pp. 364 Online Publication Date: Jul 2005 Full Text: \| Download PDF
	+ -	Show Abstract By the sixteenth century mechanical clocks and watches were making frequent appearances in works of art. A number of examples are here reproduced.

Select this Article		Some Interesting Cases of Vibrating Systems Paul F. Bartunek American Journal of Physics -- May 1956 -- Volume 24, Issue 5, pp. 369 Online Publication Date: Jul 2005 Full Text: \| Download PDF
	+ -	Show Abstract Three simple vibrating systems are described: The bifilar and trifilar pendula and the meter stick rocking on a cylindrical surface. All types afford challenging analytical problems. The bifilar pendulum with adjustable height of bob gives practice in scientific judgment, for of three possible modes of oscillation one is definitely best if one be interested in determination of g. The dumbbell model of bifilar pendulum, as well as the rocking stick, offer opportunities to study the effect of separately changing inertia and restoring factors. The trifilar pendulum offers an alternate to other common methods of measuring moments of inertia.

Select this Article		Experiments on Viscoelasticity Donald G. Ivey American Journal of Physics -- May 1956 -- Volume 24, Issue 5, pp. 373 Online Publication Date: Jul 2005 Full Text: \| Download PDF
	+ -	Show Abstract The propagation of sound waves in rubber strips is used to illustrate visco-elastic behavior. The experiments introduce time-dependent mechanical properties of solids at a level suitable for use in undergraduate laboratories.

Select this Article		Effect of Carbon Dioxide Variations on Climate Gilbert N. Plass American Journal of Physics -- May 1956 -- Volume 24, Issue 5, pp. 376 Online Publication Date: Jul 2005 Full Text: \| Download PDF
	+ -	Show Abstract Variations in the amount of atmospheric carbon dioxide cause temperature changes sufficiently large to influence the climate. If the atmospheric carbon dioxide doubles, the surface temperature rises 3.6°C; if it is cut in half, the surface temperature falls 3.8°C. Some of the factors that can be explained by the carbon dioxide theory are: during a single glacial epoch, the climate continually oscillates between a glacial and an interglacial stage with a period of tens of thousands of years with no stable state possible, when the carbon dioxide amount is below a certain critical value; the increased precipitation at the beginning of a glacial period; the time lag between the period of mountain building and the onset of glaciation; periods of glaciation occur at the same time in both hemispheres; the general warming of the climate in the last fifty years. The various factors that enter into the carbon dioxide balance and the influence of the oceans on the atmospheric carbon dioxide amount are discussed in detail. In contrast to other theories of climatic change, the carbon dioxide theory predicts a warming trend that will continue for centuries or as long as fossil fuels are burned in significant quantities.

Select this Article		Intermediate Laboratory Experiment in Physical Optics Using an Electron Microscope Joseph L. Rood American Journal of Physics -- May 1956 -- Volume 24, Issue 5, pp. 388 Online Publication Date: Jul 2005 Full Text: \| Download PDF
	+ -	Show Abstract An undergraduate laboratory experiment to study the magnification and limit of resolution of an electron microscope, appropriate to a physical optics course, is described. Polystyrene latex spheres of known diameter are used to obtain the magnification. The experiment introduces the student to some of the techniques of electron microscopy.

Select this Article		Classical Meson Theory. II S. Kahana and H. R. Coish American Journal of Physics -- May 1956 -- Volume 24, Issue 5, pp. 390 Online Publication Date: Jul 2005 Full Text: \| Download PDF
	+ -	Show Abstract Classical meson theory, to which an elementary introduction is given in part I, is applied to nuclear forces, the deuteron, meson scattering, and photoproduction.

Select this Article		New System of Physical Units and Standards Bruno F. Ludovici American Journal of Physics -- May 1956 -- Volume 24, Issue 5, pp. 400 Online Publication Date: Jul 2005 Full Text: \| Download PDF
	+ -	Show Abstract The present system of physical units and standards is critically examined with a view of the possible destruction of the present primary standards through a natural catastrophe. A new system is proposed.

Select this Article		Demonstration of an Explosion Initiated by Static Electricity D. S. Ainslie American Journal of Physics -- May 1956 -- Volume 24, Issue 5, pp. 408 Online Publication Date: Jul 2005 Full Text: \| Download PDF
		Abstract Unavailable

Select this Article		Experimental Trigonometry Don E. Harrison, Jr. American Journal of Physics -- May 1956 -- Volume 24, Issue 5, pp. 408 Online Publication Date: Jul 2005 Full Text: \| Download PDF
		Abstract Unavailable

Select this Article		Note on the Present State of Physics Curricula Schwab S. Major, Jr. American Journal of Physics -- May 1956 -- Volume 24, Issue 5, pp. 410 Online Publication Date: Jul 2005 Full Text: \| Download PDF
		Abstract Unavailable

Select this Article		Measurement of Electronic Charge-to-Mass Ratio for the General Physics Laboratory George Bradley American Journal of Physics -- May 1956 -- Volume 24, Issue 5, pp. 410 Online Publication Date: Jul 2005 Full Text: \| Download PDF
		Abstract Unavailable

Select this Article		On Transformations in Relativistic Mechanics R. K. Pathria American Journal of Physics -- May 1956 -- Volume 24, Issue 5, pp. 411 Online Publication Date: Jul 2005 Full Text: \| Download PDF
		Abstract Unavailable

Select this Article		Translational Motion of a Sphere in a Magnetic Field Herbert B. Rosenstock and Talbot A. Chubb American Journal of Physics -- May 1956 -- Volume 24, Issue 5, pp. 413 \| Cited 1 time Online Publication Date: Jul 2005 Full Text: \| Download PDF
		Abstract Unavailable

Select this Article		“Empty” Hero's Engine Henry S. Belson American Journal of Physics -- May 1956 -- Volume 24, Issue 5, pp. 413 Online Publication Date: Jul 2005 Full Text: \| Download PDF
		Abstract Unavailable

Select this Article		Ferro- and Ferrimagnetism, a Proposed Nomenclature J. Cl. De Bremaecker American Journal of Physics -- May 1956 -- Volume 24, Issue 5, pp. 414 Online Publication Date: Jul 2005 Full Text: \| Download PDF
		Abstract Unavailable

Select this Article		Inexpensive Spectrograph for the Small College Glenn F. Powers American Journal of Physics -- May 1956 -- Volume 24, Issue 5, pp. 414 Online Publication Date: Jul 2005 Full Text: \| Download PDF
		Abstract Unavailable

Select this Article		Momentum of a Rifle Bullet Paul Kirkpatrick American Journal of Physics -- May 1956 -- Volume 24, Issue 5, pp. 414 Online Publication Date: Jul 2005 Full Text: \| Download PDF
		Abstract Unavailable

Select this Article		A Query John Satterly American Journal of Physics -- May 1956 -- Volume 24, Issue 5, pp. 415 Online Publication Date: Jul 2005 Full Text: \| Download PDF
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Select this Article		Partial Course Credit? George Winchester American Journal of Physics -- May 1956 -- Volume 24, Issue 5, pp. 415 Online Publication Date: Jul 2005 Full Text: \| Download PDF
		Abstract Unavailable

Select this Article		Must and May Karl K. Darrow American Journal of Physics -- May 1956 -- Volume 24, Issue 5, pp. 415 Online Publication Date: Jul 2005 Full Text: \| Download PDF
		Abstract Unavailable

Select this Article		Kentucky Section Carl E. Adams American Journal of Physics -- May 1956 -- Volume 24, Issue 5, pp. 416 Online Publication Date: Jul 2005 Full Text: \| Download PDF
		Abstract Unavailable

Select this Article		Classical Electricity and Magnetism Wolfgang K. H. Panofsky, Author, Melba Phillips, Author, and J. M. Jauch, Reviewer American Journal of Physics -- May 1956 -- Volume 24, Issue 5, pp. 416 Online Publication Date: Jul 2005 Full Text: \| Download PDF
		Abstract Unavailable

Select this Article		Nuclear Magnetic Resonance E. R. Andrew, Author and H. S. Gutowsky, Reviewer American Journal of Physics -- May 1956 -- Volume 24, Issue 5, pp. 417 Online Publication Date: Jul 2005 Full Text: \| Download PDF
		Abstract Unavailable

Select this Article		Nuclear Physics. Vol. 1 L. Rosenfeld, Editor and R. Sherr, Reviewer American Journal of Physics -- May 1956 -- Volume 24, Issue 5, pp. 418 Online Publication Date: Jul 2005 Full Text: \| Download PDF
		Abstract Unavailable

Select this Article		Principles and Applications of Physics Otto Blüh, Author, Joseph Denison Elder, Author, and Charles A. Randall, Jr., Reviewer American Journal of Physics -- May 1956 -- Volume 24, Issue 5, pp. 418 Online Publication Date: Jul 2005 Full Text: \| Download PDF
		Abstract Unavailable