Describes an apparatus designed for demonstrating electron and ion-optical principles. The apparatus consists of (1) a high-vacuum system and (2) electron-optical components. The teaching techniques used and the experiments conducted are reported. The apparatus won second prize in Demonstration Lecture Apparatus in the A.A.P.T. Apparatus…

Describes an apparatus designed to study the properties of charged particles suspended in an electric field. The apparatus consists of a suspension chamber, an optical system and power supplies and controls. Experiments conducted include determination of particle size, charge-to-mass ratio and particle collisions and exchange. (LC)

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)

Describes a method for the extraction and bioassay of natural germination inhibitors, requiring only inexpensive equipment and minimal experimental skill. The method has been used to demonstrate qualitative/quantitative differences in germination inhibitor levels in a variety of different fruits or in different tissues within a single fruit.…

The Apple II microcomputer program described allows instructors with minimal programing experience to construct computer models of psychological phenomena for students to investigate. Use of these models eliminates need to maintain/house/breed animals or purchase sophisticated laboratory equipment. Several content models are also described,…

Dating, conservation, prospection, and composition (knowledge of the composition of artifacts of other materials) are four applications of chemistry to archaeology. Examples of the latter application (composition) are discussed, focusing on procedures used and types of information obtained. (JN)