Describes an apparatus to be used in a visual presentation of simultaneous, independent motions and their resultants. The apparatus is best suited for representing a boat and stream, but could be modified to represent a plane in a moving air mass. (Author/DS)

Presents two experimental set-ups. The first demonstrates the law of Malus using a pair of Polaroid polarizers and a monochromatic light source with an interference filter. The second describes a modification of Hilton's apparatus to demonstrate the effects of the magnetic hysteresis on an overhead projector. (CS)

Describes the following: a low-pressure sodium light source; a design of hot cathodes for plasma and electron physics experiments; a demonstration cart for a physics of sound course; Bernoulli force using coffee cups; a spark recording for the linear air track; and a demonstration of the effect of altering the cavity resonance of a violin. (GA)

Suggested specifications for microscopes for various applications are given. A discussion of the ways of meeting these specifications in practice is illustrated by current models from British and foreign manufacturers. (BB)

Describes how to convert a bicycle pump into a vacuum pump by reversing the piston and replacing or removing the one-way valve. (MLH)

This article describes the use of an immediate, repetitive replay recording system. Photographs and text describe the system and its combination with another system to achieve the desired listen/record/compare sequence. (CHK)

Compares the precision, accuracy, and response of a cooking probe to a standard mercury thermometer in side-by-side heating in temperature baths, simple and fractional distillations, and melting point determination. (DDR)

Explains why transparency film demonstrates biaxial optical properties. Provides detailed descriptions of the procedure and equipment needed for large-scale optics demonstrations of the polarization interference pattern produced by biaxial crystals. (DDR)

Describes an investigation with the primary purpose of allowing students to generate and interpret a pressure/volume diagram of a Stirling engine. Explains how the Stirling engine can be used to demonstrate the principles of operation of a refrigerator and a heat pump. (DDR)

Describes a laboratory-constructed atomic emission spectrometer with modular instrumentation components and a simple Bunsen burner atomizer with continuous sample introduction. A schematic diagram and sample data are provided. (DDR)

Describes experiments that illustrate a number of general principles such as pattern identification, displacement chromatography, and salting-out adsorption, plus an experiment that demonstrates that identification by chromatography alone is impossible. Illustrates that chromatography is still possible with quite simple means, notwithstanding the…

Describes a low-cost four-color LED photometer developed to overcome the rising cost of laboratory equipment used in general chemistry labs and introduce instrumentation at the undergraduate level. The photometer detects absorbance at selected wavelengths of visible light but retains the advantages of a dual-beam system. The unit is compact and…

Describes how to illuminate and optically stain slides for microscope use and how to interface a 35mm camera with a microscope using an adaptor. Provides equipment descriptions and sources, details about illumination, image formation, darkfield adaptors, centerable filter adaptors, darkfield stops, rheinburg filters, and choosing specimens to…

Discussed are some of the topics at the forefront of modern astronomical research. Topics include quasars, black holes, and the beginning of the universe. The uses and types of telescopes are described, both spaceborn and ground based. (KR)

Based on a survey of individuals involved in decision making about technology education, the concerns of curriculum, teaching, facilities and equipment, role and place of technology education, and support and advocacy of technology education are discussed. Recommendations from the survey group are included. (KR)