Experiments to measure range, range straggling, stopping power, and energy straggling of alpha particles are discussed in this article. Commercially available equipment with simple modifications is used for these measurements. (Author/GA)

Describes the preparation of suitable solid electrolytes and cells which may form the basis of a laboratory teaching program designed to illustrate a variety of electrochemical ideas. ( Author/CP)

Equipment and teaching suggestions for science in the middle school are presented. (CP)

Describes a series of polarography experiments using commercially available pulse polarography instruments. (SL)

Product noise ratings for a number of laboratory air blowers are reported and several recommendations for reducing laboratory noise from air blowers are given. Relevant noise ratings and methods for measuring noise emission of appliances are discussed. (BB)

Explains the theory and laboratory construction procedures of a positive photoresist. (CP)

Describes the construction of an apparatus for demonstrating the center of percussion and pivot point of a ball being struck. (MLH)

A rapid scanning polargraph, constructed from inexpensive parts, which can delay voltage scan for a predetermined length of time, is described. Schematic diagram of the instrument is included. Uses of the instrument are described. (MR)

Describes the construction of a direct-reading azimuth protractor (DRAP) used for mapping fracture and joint-surface orientations in underground mines where magnetic disturbances affect typical geologic pocket transit. (SL)

Describes the modification of the SUUNTO compass and clinometer precision sighting instruments to make a compact geologic compass useful for measuring orientations of S-surfaces and rake angles of lineations. (SL)

Describes a simple computing system which can solve the quantum mechanical problem of a particle trapped in a rectangular potential well. (SL)

Describes an apparatus for demonstrating the transmission line propagation and radiation of electromagnetic waves in the 160-170 MHZ v.h.f. region. (SL)