Describes three pieces of scientific apparatus and their demonstrational use: a high temperature apparatus for positron annihilation studies, a digitally synthesized classroom variable star, and a demonstration of plasma laser-beam focusing using paint stripper flames. (GA)

Data from this study suggest that evaluations of long-term accumulations of students' laboratory analyses should be standard procedure to detect deviations from the accepted true assays. Efforts are recommended to determine the cause of the error and the implications or grading procedures reconsidered. (Author/MA)

Discusses the adaptation of some familiar equipment for use in physics demonstrations: demonstrating waves using a folding slinky, measuring the partial pressure of water vapor, lengthening the time constant on a rate meter, measuring "g" with a phonograph turntable, and constructing a cheap signal generator. (GA)

This reaction is used in an introductory organic chemistry course to illustrate principles of gas-liquid chromatography, geometrical isomerism, homogeneous catalysis, and activation energy determinations. (BB)

Provides eight physics experiments, demonstrations, and activities relating to radioactive decay, computers, semiconductors, and electronics. (SL)

Compared five distinct classes of models of how people judge the relative sizes of named objects. Four basic experiments were all concerned with the amount of time necessary to decide which of two named things is larger. (Editor/RK)

The problem-solving performance of preschool children was examined in three conditions in which good performance was indicated as being appropriate for boys, for girls, or for both. Boys performed significantly more poorly when the task was indicated as one that girls did better. The girls' performance was not affected by the conditions of the…

The influence of variations in school setting on the development of ethnic role taking skills and ethnic identity were examined in English speaking Canadian children in grades 1-5. Their instructional settings were either monolingual in the first language (English), monolingual in a second language (French), or bilingual (French and English).…

Describes a computer simulation to elucidate the subject of coherence. The model on which simulation is based links coherence to the correlation of fields. It also describes the model and presents some results. (Author/GA)

Discusses the solubility characteristics of bromine salts. (CP)

Data reveal that the absorption spectra of alkali metals can be analyzed using a modified laboratory procedure. ( CP)

Describes the laboratory procedure to be used for an effective demonstration of aldol condensation. (CP)

Ethylene hydrogenation on a platinum catalyst, electrolytically applied to a tube wall, is a good system for the study of the interactions between diffusion and surface reaction in heterogeneous catalysis. Theoretical background, apparatus, procedure, and student performance of this experiment are discussed. (BB)

Two experiments are reported which compared different forms of presentation of a perspective-taking task. The task required 4-year-old children to select pictures showing another person's view of an array similar to Piaget and Inhelder's mountains. (Editor)

This research was undertaken to determine the factor structure of the 26-item revised versions of the Mehrabian (1968) Female and Male scales, a self-report instrument designed to measure achievement motivation. (Author/RK)