Suggestions are provided for making measurements with a Michelson interferometer (a useful tool for demonstrating the wave nature of light). By placing a lens between a television camera and interferometer, an appropriate image will be produced on a monitor. A representative photograph of TV monitor pattern is also provided. (JN)

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

Provides instructions for interfacing a pH meter directly to an Apple II microcomputer without an analog-to-digital converter. Includes program listing (with enough remark statements to make it self-documenting) in Integer Basic to display the pH readings. (Author/JN)

Spurred by National Aeronautics and Space Administration (NASA) technological advances, a budding industry is manufacturing equipment and providing services toward better management of earth's resources. Topics discussed include image processing, multispectral photography, ground use sensor, and weather data receiver. (Author/JN)

Describes a simple, student-oriented method of determining seiches and compares actual to theoretical results. Includes information about equipment needed, data gathering, and analysis of the data. (Author/DS)

Reviews the history of the most widely used device for measuring mass media audience reactions. Notes that competition and the expensive media environment have led communication scholars and policymakers to a revived interest in this device and qualitative audience measurement. (PD)

Discusses and lists, in table form, the specifications and characteristics of 28 low-cost digital multimeters, including jacks, number of V ranges, max V, cost, approximate percent accuracy, current scales, display, battery life, volume, and manufacturers. Quality of construction, ease of repair, and similar characteristics not reported. (SK)

Describes a simple seismograph which can be built quite easily and is sufficiently sensitive to record earthquake waves at home. (HM)

Describes an electric circuit permitting easy observation and measurement of the response of a damped harmonic oscillator to impulsive excitation. The impulse analysis is carried out and related to experimental observations. The phenomenon of resonance is then interpreted and demonstrated, and through it, contact is made with Fourier analysis.…

Instructions for making a simple respirometer, to measure rates of oxygen consumption of organisms, are presented. The instrument incorporates most of the basic elements of commercial respirometers but can be made inexpensively by high school students. Operating instructions and applications are given. (Author/SA)

Describes instruments for the quantitative measurement of radioactively tagged organic and biological molecules used as tracers. (MLH)

Discusses a heavy-duty KBr press that will allow undergraduate students to prepare KBr windows in room-temperature conditions. Described are the essential components and the procedures for the KBr window preparation. (YP)

Describes a technique for making reflectance measurements of opaque minerals in polished thin sections. Provides a calibration procedure, reflectance values for common opaque minerals, and a graph showing an example calibration curve of minimum shutter speed of opaque minerals versus published reflectance data. (RT)