This special report, prepared by several chemists working in the field of electron microscopy, provides information regarding the most recent developments in transmission and scanning electron microscopy that have chemical significance. (CS)

Activities are suggested for helping students understand the nature of contours (lines of constant geographic elevation), including instructions for preparing a contour map with an apparatus constructed with a sharpened stake and perpendicular crossbar, plumb line (washer tied to string), and a soda straw. (SK)

Describes an apparatus for plotting electric fields using burglar alarm window tape for electrodes and carbonized electronic stencil paper as sheet resistance. Also describes a simple pentode modulator circuit which will modulate a typical helium-neon gas laser, providing an audio channel for demonstration purposes. (SK)

Focuses on the activities of regional instrumentation centers that utilize the state-of-the-art instruments and methodology in basic scientific research. The emphasis is on the centers involved in mass spectroscopy, magnetic resonance spectroscopy, lasers, and accelerators. (SA)

Descriptions of equipment and procedures are provided for: (1) a detection system for mass-spring oscillations; (2) an economical holography table; (3) demonstration alternating-current circuit board; and (4) demonstration of damped oscillation using a set of magnets. (SK)

Laboratory procedures, equipment, teaching ideas, and resource materials related to physics are discussed. Topics include the construction of a liquid-metal pump, a hydraulic jack, and an apparatus which helps teach time/velocity graphs; current/voltage characteristics of a tungsten filament lamp; and an electric circuit game. (DC)

Describes: (1) a variable inductor suitable for an inductance-capacitance bridge consisting of a fixed cylindrical solenoid and a moveable solenoid; (2) long-range apparatus for demonstrating falling bodies; and (3) an apparatus using two lasers to demonstrate ray optics. (SK)

The activities for preschool through primary aged children identify ways in which teachers can encourage children to learn the functions of many everyday materials. (SA)

Several experiments are described using common laboratory apparatus and readily available materials to generate resonance spectra of air columns. The advantages of this apparatus and method of demonstration are visual impact and accuracy of results. (CS)

Describes the construction of an apparatus which can be used to demonstrate vapor pressures of solids, liquids, and solutions. (SK)

Describes an application of solid-state memories in a laboratory course, which enables students to build electronic devices. Also introduces the fundamentals of analog-to-digital conversion and sampling theory. (CS)

Describes an inexpensive physics apparatus and experiment to dynamically determine Young's modulus for thin reeds and wire samples. (HM)

Described is a diffusion apparatus to be used in an undergraduate physical chemistry laboratory experiment to determine the diffusion coefficients of aqueous solutions of sucrose and potassium dichromate. Included is the principle of the method, apparatus design and description, and experimental procedure. (Author/DS)

Presents the steps for drawing a block-diagram from a map in the area of structural geology. The author recommends first platting on the orthographic net, all directional data with respect to geographical reference axes. (Author/SA)

This article is the last of a three-part series dealing with sound measurement, effects, pollution, and indoor/door learning activities. This section focuses on outdoor activities and equipment that students can make to assist them in data collection. (Author/SA)