Describes a safe and simple laboratory experiment to polymerise alkenes. Uses a two components catalyst; an unsolveted Grignard reagent and titanium (IV) chloride. (GA)

Reviews the elementary level SRA Metric Measurement Program. (SL)

Photographs and text describe techniques by which color negative film can be developed and printed. An equipment list, by which black and white printing facilities can be converted to make color prints, is provided. (CP)

Describes d.c. amplifiers available through English manufacturers and laboratory experiments which can be performed with them. (SL)

Discover the treasure of learning activities in your daily paper. This 20-cent text has resources for teaching reading, language arts, mathematics, science, social studies, art, career education, and local history. (Editor)

Describes exercises for students to estimate the magnitude of energy available through solar power, wind, atmospheric electricity, heat capacity of air, and latent heat of air. (SL)

Describes a method for testing the chlorine content of water. (SL)

Describes experiments used to illustrate the kinetics of reversible chemical reaction. (SL)

Using the simple optical system and photodiode described in this article it is possible to give clear, quantitative demonstrations of all the Fraunhofer diffraction phenomena at single and multiple apertures. These measurements can be related to the theoretical predictions given in standard textbooks. Circuit diagram and optical layout are…

Illustrated and described is the design of an apparatus that can be used by students in a short period of time. It gives quantitative results showing evidence of thermoelastic properties of fluids near the critical point. (Author/MA)

Describes experiments for determining the dielectric constants of liquids and measuring capacitor dissipation. (SL)

Surface tension, a characteristic of liquids, is discussed in this article. Several activities appropriate to the elementary grades are described and explained. Each activity uses common materials to explore this tendancy of water to act as if it were surrounded by a membrane. (MA)

Describes an experiment using flow densimetry for determining the solution concentration in equilibrium with the excess solid solvent present. (SL)

Describes an inexpensive device for students to measure Planck's constant using the photoelectric effect. (SL)

Describes experiments simulating the mechanics of the human elbow and back. (SL)