Describes two experimental apparatus which may be used to demonstrate the skin effect phenomenon. One apparatus shows the decrease of a magnetic field as it penetrates a thickness of metal; the other demonstrates the decrease with depth of current in a wire. (Author/MLH)

Describes 5 solar energy experiments that can be used in secondary school: flat-plate collector, solar thermoelectric generator, simple concentrators, solar cell, and natural storage of solar energy. (MLH)

Describes a set of student projects, each involving about 240 hours of laboratory time, covering the following topics: wind power monitoring, wind generator design, solar power, and the heat pump. (MLH)

Paul Friedberg designs playgrounds that provide opportunities for physical play, which develops motor skills; social play, the interaction between children; and cognitive play, the problem-solving process. (Author/MLF)

Describes an experiment that uses anodic stripping voltammetry as an alternative to atomic absorption for quantitating lead and cadmium leached from pottery samples. (MLH)

Describes an organic-biological experiment that illustrates an important chemical commercial process and the use of microorganisms as chemical reagents. (MLH)

Describes an experiment that used a four-element radio interferometer to illustrate gravitational deflection as predicted by the theory of general relativity. (MLH)

Describes an experiment in which the iodonation of aniline reaction is shown to undergo catalysis in solution of sodium lauryl sulfate which forms micelles with negatively charged pseudo surfaces. (MLH)

Describes a unified experiment in which an optically transparent thin layer electrode is used to illustrate the techniques of thin layer electrochemistry, cyclic voltammetry, controlled potential coulometry, and spectroelectrochemistry. (MLH)

Describes an advanced undergraduate experiment in which the stepwise stability constants of hi(II)-cysteine chelate are determined. (MLH)

Describes an experiment in which ph values serve as a basis for separating the acidic aspirin from phenacetin and caffeine on an ion-exchange column. (MLH)

Describes an advanced undergraduate laboratory experiment for studying thermionic emission. The cathode of a type 922 photodiode is used as an emitter over a temperature range from room temperature to 80 degrees centigrade; the thermionic emission current varies by a factor of 3000 over this temperature range. (MLH)

Describes the library seminar, an experiment in the learning process in which a group of students learn individually and collectively through a book and in a library. (Author)

Briefly describes the ecology of a deciduous forest, and suggests activities for observing and appreciating the changes that occur during the Fall. Simple experiments relating to mosses and lichens are outlined. (JR)