Described is the equipment and procedures used to prepare and display petrological (thin rock) sections without the use of sophisticated apparatus. (SL)

Discusses a high school laboratory in which the students take an active role in designing, implementing, and performing experiments concerning basic concepts in physics. (MLH)

Describes several chemistry projects, including solubility, formula for magnesium oxide, dissociation of dinitrogen tetroxide, use of 1-chloro-2, 4-dinitrobenzene, migration of ions, heats of neutralizations, use of pocket calculators, sonic cleaning, oxidation states of manganese, and cell potentials. Includes an extract from Chemical Age on…

Described are science experiments which utilize methylene blue to demonstrate the effects of pH, temperature inhibitors, and concentration on enzyme reactions in yeast enzyme systems. (SL)

Describes construction of two flashing light sources: an adjustable-rate battery-powered flasher and a neon tube powered by a 60-hertz electrical outlet. Both devices may be used for a variety of activities, including studies of free-falling object, pendulum period variation, and acceleration due to gravity. (JN)

Four ways in which microcomputers can be turned into laboratory instruments are discussed. These include adding an analog/digital (A/D) converter on a printed circuit board, adding an external A/D converter using the computer's serial port, attaching transducers to the game paddle ports, or connecting an instrument to the computer. (JN)

A simple apparatus (constructed of glass) for measuring surface tension is described. Procedures and typical results are included. (JN)

Describes rationale, need, and purpose of three lists of objectives (included in appendices) of objectives for skills and abilities related to experimental, practical work in biology, chemistry, and physics. (SK)

Describes sensory assessment techniques and conditions for their satisfactory performance, including how they can provide open-ended exercises and advantages as relatively inexpensive and simple methods of teaching experimentation. Experiments described focus on diffusion of salt into potatoes after being cooked in boiled salted water. (Author/JN)

Briefly describes three science experiments: (1) universal curve for tape times; (2) depiction of magnetic fields; and (3) alpha particle detection by a Kodak LR 115:II plastic film. (SK)

Describes experiments on properties of leather performed by a science teacher, assisted by senior science students. Concludes that the finish layer contributes a major part of the resistance to air passage, reducing permeability of leather. Flexing increases permeability and may, in its action, discriminate between finishes. (Author/JN)

Describes: (1) an apparatus which provides a simple method for measuring Stefan's constant; (2) a simple phase shifting circuit; (3) a radioactive decay computer program (for ZX81); and (4) phase difference between transformer voltages. (Author/JN)

Describes an experiment with resolving ability and how it varies according to the aperture of the telescope used (including the human eye). Although designed for use in college laboratory classes, a method is included that amateur astronomers can use to determine the actual resolving powers of their telescopes. (JN)

Describes a series of experiments which a group of 12- to 14-year-old students developed and conducted as they attempted to design a solar panel. Includes an outline of their building procedures. (DC)

Discusses the role, importance, and benefits of performing demonstrations in physics. Suggests that actual demonstrations are more valuable than those presented on films or videotapes. (SK)