Describes an apparatus designed for observing the motion of delicate mechanical systems. The apparatus consists of a light-spot follower attachment connected to a servo-recorder. The oscillations of a triple-torsion pendulum and of a Cavendish balance have been studied. (LC)

Describes an apparatus designed to demonstrate vortical flow of a fluid. The apparatus consists of a transparent acrylic cylinder, with a drain hole, and mounted so that it can be rotated about its axis at speeds up to 1000 rpm. Experimental observations with water as the fluid under study are reported. (LC)

Examines the controversy surrounding the validity and interpretation of electron microscope images. (DS)

Summarizes workshop notes on the use of a variety of test dipsticks to determine qualitative and quantitative aspects for several common food items. Discusses availability, tests, and uses for these dipsticks: Merckoquant, Clinistix, and Multimix. (CS)

Describes the procedures for construction of a nitrate coated-wire ion selective electrode and suggests experiments for evaluation of electrode response and illustration of typical analytical applications of ion selective electrodes. (CS)

Describes a way to construct from aluminum foil and a tin can a detector of ionizing radiation in the environment. (Author/SA)

Describes the following laboratory equipment: Biophysics modules to perform bioelectronic investigations of the human body; a large sine wave analog for large audience demonstrations; a resonance tube for measurement of speed of sound; and the snooperscope, a gadget to demonstrate infrared waves. (GA)

Describes a versatile apparatus for demonstrating the imaging properties of various types of electrostatic lenses. The apparatus can be used to study the focusing properties of different types of electrostatic electron or ion lenses or their combinations. (MLH)

Describes several demonstrations that feature interaction of light with soap bubbles. Includes directions about how to produce a long-lasting stationary soap bubble with an easily changeable size and describes the interaction of white light with the bubble. (DDR)

Reports on an effort to replace power supplies in an electron charge lab with power supplies from personal computers. Details the process involved in updating the lab. (DDR)

Describes the application of an integrated-circuit (IC) chip which provides an easy-to-use, inexpensive, rugged, computer-interfaceable temperature sensor for calorimetry and differential temperature measurement. Discusses its design and advantages. (JRH)

Discusses strategies to duplicate current research protocols using biochemical methods of analysis. Describes the use of the Silver Sequence kit that provides a technically simple and relatively inexpensive DNA sequencing exercise. (JRH)

Describes an experiment demonstrating Lenz's law by measuring a magnet falling through a copper tube compared to a nonmagnet falling. Presents diagrams and pictures showing the apparatus. (YP)

Discussion of laboratory cabinets and desk systems looks at considerations of cost, flexibility, utility, serviceability, storage capacity, future availability of compatible components, and safety or other legal compliance issues. Four system types (standard floor-mounted, C-frame, end rigger-leg frame suspended, unistrut) are described, and…

Presents some suggestions on how to cope with problems of insufficient equipment and how to teach chemistry even without sophisticated lab equipment. (Author/MKR)