Describes 10 computer programs used to draw diagrams usually drawn on chalkboards, such as addition of three vectors, vector components, range of a projectile, lissajous figures, beats, isotherms, Snell's law, waves passing through a lens, magnetic field due to Helmholtz coils, and three curves. Several programming tips are included. (JN)

Describes how one logical scheme for the gearing for a multi-speed touring bicycle leads to a set of gear ratios which increase in an exponential function. (BT)

Discusses the history of Rudolph Koenig's contribution to the development of acoustical apparatus. Contributions include the clock fork to determine absolute acoustic frequencies, a forerunner of the oscilloscope called the manometric flame, and an acoustic interference apparatus used in the Fourier synthesis of musical sounds. (MDH)

Describes a secondary-level physics course set up as a cooperative venture by an independent secondary school and a college. The course (part of the School-College Articulation Program (SCAP) combines content, style, and structure of college courses with surroundings familiar to students. Aims of the SCAP program are also described. (JN)

Describes the Packard's Falling Body Apparatus, invented by John C. Packard, which is essentially an inclined plane combined with a simple and elegant method of measuring the relative time of descent of a steel ball. (JRH)

Summarizes Charles Wheatstone's 1843 paper introducing the Wheatstone bridge and the rheostat. (SL)

Here is a quick way to measure the index of refraction of water using the phenomenon of total internal reflection.

Describes the use of 35 mm slides consisting of a diagram of photograph and 15 to 60 words of text to augment laboratory instruction. (GS)

Describes an experiment that uses the ultrasonic transducer for demonstrating the Fourier components of waveshapes such as the square and triangular waves produced by laboratory function generators. (JRH)

Describes an hour-long activity to illustrate the properties and use of cylindrical concave mirrors. Appropriate for non-science majors or high school students. (WRM)

Describes the construction and use of a set of "relativistic metersticks" that represent the apparent lengths of a meterstick passing a stationary observer at relative speed v/c. (WRM)

Presents experiments that use Helmholtz resonators and have been designed for a sophomore-level course in oscillations and waves. Discusses the theory of the Helmholtz resonator and resonance curves. (JRH)