Reports on a method of determining the coefficient of friction of an object through the use of a record turntable. (CP)

An activity in which students combine physical and mathematical principles in a measurement situation is described. (SD)

Describes the experimental procedure used in determining the lifetime of tantalum-181. (CP)

Presents an undergraduate laboratory exercise in elementary statistics in which students verify empirically the various aspects of the Gaussian distribution. Sampling techniques and other commonly used statistical procedures are introduced. (CP)

Describes an experiment in teaching research methods to undergraduate students in political science. The experiment centered around a data lab that met weekly and provided students with information pertaining to data processing and statistics. Information on student evaluation of the experiment is included. (Author/DB)

A simple experiment: adults allowed to study in sixth forms. The article examines the results of the last two years. (Editor/RK)

The effects of three types of laboratory instruction on transfer of learning from a single-cylinder agricultural engine to a multicylinder agricultural engine in the area of carburetion were studied. There were no significant differences among treatment groups on mean quality scores. Instruction method did affect task completion time. (JH)

A gas pressure gauge has been constructed for use in a student experiment involving the law of atmospheres. From pressure data obtained at selected elevations the average mass of air molecules is determined and compared to that calculated from the molecular weights and percentages of constituents to the air. (Author/BB)

Describes some undergraduate laboratory experiments on thermoanalytical techniques which deal with both organic and inorganic compounds. (GA)

Describes a modified experiment to measure the internal resistance of an energy source, where a small resistance is connected in series with the source. (GA)

For teachers in search of an easily obtainable, readily dissectable, and unique living specimen to arouse the interest of their students and illustrate important biological principles, lichens are the perfect selection. Background information and experiments on lichen anatomy, physiology, and chemistry are given. An appendix gives culture media.…

Exercises are presented for classification of marine algae on the basis of biochemical characteristics such as pigmentation, cell wall components, and food storage products. (BB)

Describes some laboratory apparatus, chemistry experiments and demonstrations, such as a Kofler block melting point apparatus, chromatographic investigation of the phosphoric acid, x-ray diffraction, the fountain experiment, endothermic sherbet, the measurement of viscosity, ionization energies and electronic configurations. (GA)

Explains some middle school science demonstrations and experiments: included are a simplified circuit board, a scheme for the identification of plastics, a soot-free bunsen burner, science in a packet of cornflakes, and perceptual ambiguities with a "Chinese Compass." (GA)