Oriented to teaching graphic arts instructors how to reproduce a continuous tone original via the halftone process. (Editor)

The mini-experiment has the advantage of familiarizing students with the format of a quantitative study and serving as a model for their own written reports. (Author)

Presents experiments with a straight line seen for a short stimulus time in which the subjects perceived the line to lengthen from the point of fixation and then to shorten to the point of fixation immediately thereafter. (MB)

Argues that as well as obtaining a subject's informed consent a researcher is ethically obliged to furnish financial protection to research subjects. Discusses possible methods of insurance. (EB)

This paper presents validational evidence for the Group Therapy Questionnaire (GTQ), a self report instrument designed to detect leadership styles in group therapy. These studies suggest the potential value of the GTQ for investigations requiring measurement of leadership styles. (Author)

Debates the value of experimentation as a tool in educational research. (MK)

Describes a simple ultrasonic experiment that can be used to measure the purity of liquid samples by detecting variations in the velocity of sound. Uses a phase shift detection technique that incorporates the use of logic gates and a piezoelectric transducer. (JRH)

Presents an exercise to measure the modulus of elasticity of spider silk using a microforce transducer that can be built from materials readily available in the laboratory. (JRH)

Describes the construction of a low-cost handmade apparatus for the electrolysis of water that is durable enough to endure rough treatment. (JRH)

Three experiments studied preschoolers' understanding of false beliefs resulting from developmental misconceptions. Found that children showed some (but incomplete) mastery of Level 2 perspective taking, appearance-reality distinction, line of sight, and biological principles of growth and innate potential. Performance was comparable to that with…

Presents experiments that introduce students to the myriad properties of zeolites using the sodium form of zeolite A (Na-A) from laundry detergent. Experiments include extracting Na-A from detergent, water softening properties, desiccant properties, ion-exchange properties, and Zeolite HA as a dehydration catalyst. (JRH)

Describes the construction of the Reduced-Gravity Demonstrator, which can be used to illustrate the effects of gravity on a variety of phenomena, including the way fluids flow, flames burn, and mechanical systems behave. Presents experiments, appropriate for classroom use, to demonstrate how the behavior of common physical systems change when…

Presents a simple and inexpensive procedure for determining the moment of inertia of a physical pendulum both experimentally and analytically. The simplicity of the apparatus enables students to easily change parameters and obtain a wide variety of measurements. (JRH)