Provides a detailed description of the logic circuitry required for the experiment on undergraduate statistics described in SE 516 104. (CP)

A salt model was developed as a teaching tool to demonstrate the development of caverns and karst topography. Salt slabs are placed in a watertight box to represent fractured limestone. Erosion resulting from water flow can be photographed in time-lapse sequence or demonstrated in the laboratory. (Author/CP)

Using the basic Bagnold design, a relatively inexpensive suction-type wind tunnel can be constructed for laboratory demonstration of sand-grain movement, ripple development, and other eolian processes. Its simple design provides no workshop problems and it can be made for a total cost in materials of approximately $225. (Author/CP)

A gas pressure gauge has been constructed for use in a student experiment involving the law of atmospheres. From pressure data obtained at selected elevations the average mass of air molecules is determined and compared to that calculated from the molecular weights and percentages of constituents to the air. (Author/BB)

Describes a simple method for establishing the end point in a volumetric analysis that will save time, and reduce both the titration error and the required amount of reagents. (GA)

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)

Provides demonstrations using digital display instruments of some of the mass and pH-related topics covered in first-year chemistry courses. (CP)

Experimental procedures for studying enzyme activity using a Spectronic 20 spectrophotometer are described. The experiments demonstrate the effect of pH, temperature, and inhibitors on enzyme activity and allow the determination of Km, Vmax, and Kcat. These procedures are designed for teaching large lower-level biochemistry classes. (MR)

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

Describes a low cost potentiostat/coulometer which can maintain an eletroylsis current of up to 100 MA at cell voltages as high as 100V. (Author/SL)

Reviews recent developments in chromatographic instrumentation. (SL)

Laboratory techniques and teaching methods on applied biology topics are described. (CP)

Provides contributed suggestions in applied topics of secondary school physics. Entries include notes on instructional materials, methodology and laboratory techniques. (CP)