Describes multifunctional instruments which combine the functions of power supplies, amplifiers, oscillators, and various switching circuits. (SL)

Describes d.c. amplifiers available through English manufacturers and laboratory experiments which can be performed with them. (SL)

Describes physics laboratory equipment including: circuit improvements for an electronic counter-timer, a commercial counter-timer-frequency meter, and a device for demonstrating resonating air columns. (SL)

Describes a method of introducing secondary or college students to direct-current electricity via a technique used for elementary level students. (SL)

Describes experiments conducted with semiconductors, photo-cells, and an oscilloscope. (SL)

Discusses participation of science teachers in the American Association of Physics Teachers (AAPT), particularly within activities of the New England states section. (SL)

Second part of an article describing the use of programmable calculators to solve complex physics problems. (SL)

Uses elementary methods to introduce a model which accurately describes fundamental properties of a star in radiative equilibrium. (SL)

Describes an experimental arrangement which provides a simple introduction to holographic interferometry. (SL)

Presents simple and inexpensive demonstrations of properties of metallic glasses. (SL)

Describes exercises for students to estimate the magnitude of energy available through solar power, wind, atmospheric electricity, heat capacity of air, and latent heat of air. (SL)

Using the simple optical system and photodiode described in this article it is possible to give clear, quantitative demonstrations of all the Fraunhofer diffraction phenomena at single and multiple apertures. These measurements can be related to the theoretical predictions given in standard textbooks. Circuit diagram and optical layout are…

Traditional undergraduate courses in gas kinetic theory encourage the view that in all collisions between a gas atom and a surface, the angle of incidence of the gas atom equals its angle of reflection. This article illustrates and explains the incorrectness in assuming specular reflection and zero dwell time. (Author/MA)

Illustrated and described is the design of an apparatus that can be used by students in a short period of time. It gives quantitative results showing evidence of thermoelastic properties of fluids near the critical point. (Author/MA)

Quarks are elementary particles considered to be components of the proton, the neutron, and others. This article presents the quark model as a mathematical concept. Also discussed are gluons and bag models. A bibliography is included. (MA)