Described is a mechanically driven device for generating three-dimensional harmonic space figures with different frequencies and phase angles on the X, Y, and Z axes. Discussed are apparatus, viewing stereo pairs, equations of motion, and using space figures in classroom. (YP)

Develops a manostat which is simple and inexpensive to construct and operate, compact and rugged in design, useful over a wide pressure range, and well adapted for practical usage. Provides methodology, a diagram, and some operating suggestions. (MVL)

Describes ways to use nomographs, including solving equations for equivalent resistance of a parallel circuit, focal length of a thin lens, parallel combinations of standard resistance, average speed, refraction problem, and height of a vertically projected object. (YP)

Describes a demonstration of Coriolis acceleration. Discusses two different meanings of "Coriolis" and two causes of Coriolis acceleration. Gives a set-up method of the demonstration apparatus by using a rotary disk with rubber tubing for tap water, switches, lamps, battery, and counterweight. Provides two pictures with operating method.…

Discusses image reflection in a plane mirror. Illustrates several cases of the reflection and points out the possibility of confusing students by using the term "lateral inversion." (YP)

Provides a description, photograph, and relevant analysis of a simple device for demonstration of rotational motion. (LZ)

Describes the construction and use of simple optical aids that allow the amateur scientist to safely observe sunspots and solar eclipses and also to measure the sun's rotation. (five references) (JJK)

Evaluates the technical efficacy of the V-Scope in measuring motion produced by a phonograph turntable, a template furnished by the manufacturer, a free-fall apparatus, some pendula, a gyroscope, and three air tables. Concludes that the V-Scope gives excellent results and is easy to use. (MDH)

Presents instructions to build a device that helps students see the effects of the ultraviolet radiation around them. Suggests ways to utilize the device. (MDH)

Presents a design for constructing a colorimeter as an alternative to the more expensive spectrophotometer. The materials cost less than $25.00. (PR)

Describes the construction and use of a spectroscope using a compact disk as a reflection grating. Lists instructions for viewing emission spectra of white or fluorescent light sources or discharge tubes, and absorption spectra of colored solutions. Includes modified directions and expanded activities. Contains 16 references. (WRM)

Describes a method for demonstrating beat phenomena by creating standing waves in strings. (WRM)

Describes the construction and use of a portable "sparker" or "lightning machine" that can be used to demonstrate dielectric breakdown of air. (WRM)

Explains why one orientation of an asymmetric spring-and-mass system leads to a higher frequency of 0000000000 than another orientation. (WRM)