Describes the author's visit to the Italian cities where Galileo lived. Discusses the legendary swinging Cathedral lamp and the Leaning Tower of Pisa. Describes the science apparatus used by Galileo and other men of science which appear in the Museum of the History of Science in Florence. Presents six pictures of items viewed within the museum.…

Describes a demonstration in which a ball is placed in an unstable position on a saddle shape. The ball becomes stable when it is rotated above some threshold angular velocity. The demonstration is a mechanical analog of confining a particle in a "Paul Trap". (DDR)

The construction of combined plastic membrane electrode for hydralazinium cation from a disposed glass electrode is described. A variety of electrodes could be prepared by students using other types of polymers, plasticizers, or exchangers which could also help to study effects of pH and temperature, or environmental investigations.

Understanding electricity is never easy, especially in introductory courses. Students cannot observe the underlying physical processes and are often, at the same time, being introduced to the use of new measuring instruments. The use of a simple ammeter, either analogue or digital, requires students to break the circuit whenever a change in…

Describes the desk top calculators now on the market, including manufacturers, prices, and functions performed. Provides a table of specifications for programmable desk calculators. (MLH)