Describes the use of inexpensive polarimeters in laboratory experiments for general chemistry courses. (SL)

Outlines the construction, basic principles, calibration, and laboratory application of a device for the investigation of static charge phenomena. (GS)

Describes an advanced undergraduate laboratory experiment for studying thermionic emission. The cathode of a type 922 photodiode is used as an emitter over a temperature range from room temperature to 80 degrees centigrade; the thermionic emission current varies by a factor of 3000 over this temperature range. (MLH)

Describes a low-cost wave analyzer; how to convert an incandescant light bulb to an x-ray tube; how to use an electric toothbrush to generate waves; the use of a light-emitting diode as a point light source; how to rejuvenate helium-neon lasers; and calibration of an ammeter. (MLH)

Describes the design, construction, and performance of a low-cost, transversely excited molecular nitrogen laser. Suggests simple experiments and demonstrations using this laser. (MLH)

Discusses the technique of producing a grating with a spacing of 1 micron and 5 slits 50 microns long and 0.3 micron wide. Indicates that the slits are suitable for use in examination of electron diffraction patterns in the Gedanken experiment. (CC)

Presents the construction aspects of a simple but reliable colorimeter made from locally available components. Notes the absorption range to be 400-750-nm. Lists seven experiments done on the instrument. (MVL)