This paper reports the development, operation, and initial performance evaluations of an electrical engineering laboratory station equipped for computer-guided experimentation (CGE). A practical evaluation of the actual instructional value of two programed lessons utilizing this new system for laboratory instruction and experimentation is also…

The history of the use of laboratory work in teaching science is traced from the 18th century to the present laboratory-centered curricula. Major rationales and objectives for laboratory work are presented, and different types of laboratory activities are discussed from the standpoint of learning theories and research findings. Also discussed is…

Explains that triglycerides consist of a mixture of different compounds, depending on the total number of fatty acid constituents. Details the method and instrumentation necessary for students to analyze a vegetable oil for its triglyceride content. Describes sample results. (CW)

Should a prism be centered to measure the apex angle and refraction index? Concludes that centering the prism is not critical, and that there is an interval for which the prism can be displaced. (YP)

Describes an experiment that provides a study of the different colors and shapes of crystals of transition metal dimethylglyoxime complexes with the use of a low power microscope. Discusses the preparation and examination of the crystals. (CW)

Presents an experimental example illustrating the most common methods for the determination of kinetic parameters. Discusses the different theories and equations to be applied and the mechanism derived from the kinetic results. (CW)

Describes a simple method for determining self-inductance of non-ferromagnetic rings. Suggests fitting the ring with an auxiliary coil and using a solenoid driven with a known frequency alternating current. Amplitude change and phase shift can be measured and used to calculate inductance. Material list, calculations, and sample results are given.…

Characterizes a number of the bench-type chemical laboratory hoods. Reports results of a study that determined the levels of protection each type provides, exploring variables such as laboratory air supply systems, face velocity, work practices, personnel movement, and the effect of equipment location in the hood. (CS)

Describes a new apparatus for Drosophila habitats which has the advantage of leaving pupae and adult flies undisturbed while being able to renew or move the media and larvae at will. (CS)

Presents one of the modules of the Science Teaching Project of Australia. The module, Science Room Management, is designed to help teachers organize their science rooms so that they can use them more efficiently. (HM)

Suggestions are given for safety precautions in the secondary school science laboratory. Emphasis is placed on fire safety and identification of particularly hazardous situations. (SA)

Year 11 students investigated the real-world problem of whether screws are really brass. It allowed them to use the colorimeter and computer interface in a way that was easily understood and models normal practice in testing laboratories. Screws were dissolved in nitric acid and their absorbance of red light was compared with a standard curve.…

Presents a programed method that inventories and classifies hazards. 8iscusses the following topics: (1) student and hazard source, (2) elimination of the source, (3) adaptation of the source, (4) isolation of the source, (5) adjustment of the surroundings, (6) isolation of man, and (7) personal protective equipment. (MVL)

Provides a point of view that the organic lab is a good place for the student to use and learn problem solving skills while performing the cookbook experiments. Notes that an equilibrium between the theoretical and practical aspects of organic chemistry should be established. (MVL)

Describes a chemistry laboratory software package for interfacing the Apple IIe for high school and introductory college courses. Topics include: thermistor calibration, phase change, heat of reaction, freezing point depression, Beer's law, and color decay in crystal violet. Explains the computer interface and the tools needed. (MVL)