Describes how to construct a thermometer from a ballpoint pen; how to illustrate standing waves with pocket combs; and various physics demonstrations using oval panty hose containers. (MLH)

Describes a versatile apparatus for demonstrating the imaging properties of various types of electrostatic lenses. The apparatus can be used to study the focusing properties of different types of electrostatic electron or ion lenses or their combinations. (MLH)

Presents a simplified model that illustrates the behavior of radiometers in steady state operation, and implications of the law of interaction between a rarefied gas and a solid surface. (MLH)

Explores the dominant factor controlling the distribution of Daphnia. Describes components of a temperature gradient apparatus that can be assembled from materials readily obtainable in the laboratory and hardware stores. Investigates whether the mean depth of Daphnia is determined by temperature. (KHR)

Describes an automatic pipette washer that is functional, inexpensive, and easy to construct from locally available parts. (KHR)

Discusses the nature, resolution, focal length, and angle of a pinhole camera. Describes the development and some applications of the camera. Nineteen references are listed. (YP)

Two promising new technological tools for science education are described: microcomputer-based laboratories and science telecommunications networks. Explained are the benefits of these tools for students with learning disabilities (including emphasis on nonverbal images and improvements in student focus and communication skills) and guidelines…

Presents some suggestions on how to cope with problems of insufficient equipment and how to teach chemistry even without sophisticated lab equipment. (Author/MKR)

Describes the construction of a simple micro well colorimeter, some examples of its use, and its value in a high school or undergraduate chemistry curriculum. (ZWH)

Ignoring the interpretive problems of temperature measurement deprives students of a beneficial, positive educational experience. Suggests experimenting with different thermometers including a copper resistance thermometer, a thermistor, a thermocouple, and a constant-volume air thermometer. Provides guidance for the classroom discussion of…

Describes Herschel's demonstration of interference arising from many coherent rays. Presents a method for students to reproduce this demonstration and obtain beautiful multiple-beam interference patterns. (CCM)

Presents problems appropriate for high school and college students that highlight dilution methods. Promotes an understanding of dilution methods in order to prevent the unnecessary waste of chemicals and glassware in biology laboratories. (JRH)

This is another great month for evening observing as four planets continue to remain easily visible. Venus, Mars, and Saturn can be viewed over the western horizon, and Jupiter is shining high over the southeastern horizon. Opportunities will also exist for using binoculars or low-power telescopes to observe conjunctions between the planets, the…

A device designed to demonstrate the dependence of viscosity on temperature and to check the validity of the exponential relationship is described. The device has the advantage of versatility as it can be adapted to different types of viscosimeters.