Describes an inexpensive device (around $8.00) for measuring light. The circuit used includes five resistors, three small capacitors, a cadmium sulfide light sensor, two integrated circuits, and two light-emitting diodes. The unit is constructed on a small perforated circuit board and powered by a 9-V transistor radio battery. (JN)

A brief, intensive, competency-based workshop successfully helped 11 secondary school teachers (6 females, 5 males) from West Virginia prepare for and conduct classroom research experiments. These experiments were an effective staff development activity for career education. Career-related instruction appeared to foster positive student attitudes…

Discusses several science experiments/activities and their associated measurements. These include a simple projectile activity, cartesian diver (used to measure altitude and atmospheric pressure), experiment demonstrating atmospheric pressure, and activities using a stroboscope, and electrometer. (JN)

Describes ray tracing techniques and the method of virtual mirrors to locate images when using multiple mirrors. (JN)

Describes (1) a rippler assembly which makes use of a loud speaker and a stroboscopic light source designed for this application; and (2) an experiment using a force table that has been modified for a capstan experiment. (JN)

Described are some experiments on geotropism that may be done using dandelions. (PB)

Provides physics teachers with comments on the value and role of demonstrations during lecture sessions. (SK)

Briefly refers to the history, physiological background, and adaptive implications of two theories concerning the limits of sensory discrimination. An experiment is described, suitable for college and high school students, which investigates the validity of the two theories. (CS)

Presents two articles which are part of a series concerned with safety in school science in the United Kingdom. The two articles deal with restricted chemicals and experiments. (HM)

Describes the British Gypsum, a school-industry science project, designed to link the school with local industry. Teaching strategy, some experiments, and evaluation of the project are also included. (HM)

Presents a demonstration of the effect of alkyl free radical stability on the rate of free radical halogenation of hydrocarbons. The arenes toluene, ethylbenzene and comene are photobrominated comparatively, using an overhead projector both to provide a light source for the chemical reaction and to project the results on a screen. (CS)

Describes three activities: determination of the heat of combustion of a commercial breakfast cereal, qualitative analysis of halogens using hexane, and production of transparent soap. (CS)

Described is a method of studying growing crystals in a classroom utilizing a carrousel projector standing vertically. A saturated salt solution is placed on a slide on the lens of the projector and the heat from the projector causes the water to evaporate and salt to crystalize. (Author/DS)

Presents a demonstration of wave behavior, and experiments of (1) the determination of the mechanical equivalent of heat, and (2) a "discovery" investigation based on the maximum-span staircase. (CS)

Describes experiments, including the measurement of the magnetic moment of a magnet, using noncalibrated materials. Results of these experiments can be checked using calibrated equipment. (SK)