Describes the design of a low-cost electronic circuit to serve as a differential thermostat, to control the operation of a solar heating system. It uses inexpensive diodes for sensoring temperature, and a mechanical relay for a switch. (GA)

Reviews recent developments in the study of an ultrafast process which utilizes short flashes of light. (SL)

A simple and accessible calculation is given of the effects of eddy currents for a sphere in the field of a single circular loop of alternating current. These calculations should help toward the inclusion of eddy current effects in upper undergraduate physics courses. (BB)

Discusses Benjamin Franklin's contributions to science, particularly electricity. (SL)

Explores a view of the cosmological evolution of the universe. (SL)

Suggests a scheme in which the letter-symbols of the Latin alphabet, together with superscript and subscript notation, are sufficient to represent almost any physics concept. (MLH)

Discusses the role of phonon quasi-particles in a wide range of phenomena from simple thermal properties to super conductivity and other electric and magnetic phase transitions. (MLH)

Reviews books on practical physics available through English publishers. Each review includes author, title, publisher, number of pages, and cost. (SL)

Discusses input and output characteristics, basic circuits, and interfacing complimentary metal oxide semiconductor (CMOS) digital logic devices to other devices. (SL)

Presents a derivation of the minimum possible bandwidth of a laser oscillator. (SL)

Reviews Galileo's experiments with falling bodies conducted at the Tower of Pisa. Results indicate it is doubtful that he could have obtained the results claimed in the legend. (SL)

Reviews the role of the radiotherapy branch of medical physics. (SL)

Describes a college level exercise in physics for measuring the earth's resistivity. (SL)

Describes a quantitative experiment of measuring the characteristics of a cylindrical Langmuir probe and the ion density in the flame plasma of a seeded propane flame. (SL)

Discusses early attitudes toward the transistor and the resulting consequences of these attitudes. (SL)