Describes an inexpensive device for students to measure Planck's constant using the photoelectric effect. (SL)

Describes a procedure for modifying an interferometer which compensates for distortions when making interferograms. (SL)

Reviews new instruments, new literature, and new chemicals advertised in this issue of their journal. (SL)

Describes apparatus for electrostatic painting and two different Foucault pendulum demonstrations. (SL)

Describes a method for modifying a four-function pocket calculator so that it can be used as a pulse counter. (SL)

Provides the theory behind the construction of a classroom seismograph. Data obtained from such a device is presented. (CP)

Describes a class of ion-selective electrodes that use a solid-state sensing membrane. These are suitable for student activities. (SL)

Describes four experiments in mechanics which utilize a tennis ball serving machine. (SL)

Describes a method of bottle cutting. The bottle is filled half full of motor oil and a heated iron rod is inserted into the oil. (SL)

Explores questions, dilemmas, and issues facing individuals who teach and/or development undergraduate curricula in chemical instrumentation. Areas addressed include the instrumental analysis course, the laboratory, the role of electronics, and computer use. (JN)

Six articles address: (1) the impact of science on the physical examination and treatment of books; (2) equipment for physical examination of books; (3) research using the cyclotron for historical analysis; (4) scientific analysis of paper and ink in early maps; (5) recent advances in automation; and (6) cataloging standards. (MES)

Describes the Cygnus Loop, one of brightest and most easily studied of the older "remnant nebulae" of supernova outbursts. Discusses some of the historical events surrounding the discovery and measurement of the Cygnus Loop and makes some projections on its future. (TW)

The use of green, red, and far-red light-emitting diodes (LEDs) as light sources for plant physiological studies is outlined and evaluated. Indicates that LED lamps have the advantage over conventional light sources in that they are lightweight, low-cost, portable, easily constructed, and do not require color filters. (Author/DH)

Proposes use of an operative procedure (for studying chemical reactions in solution by nonisothermic methods) employing an electronic device that is inexpensive and easy to build and that gives excellent results. A diagram of the temperature controller in operation and a circuit diagram for the motor are included. (JN)

Discusses the properties of laser light, reviews types of lasers, presents operating principles, and considers mechanical aspects of laser light production. Applications reviewed include spectroscopy, photochemical reaction initiation, and investigation of biological processes involving porphyrins. (JM)