A new scale is suggested, with the objective of simplifying relationships between the various scales and units used in spectroscopy. Although there are certain drawbacks to such a scale, it is hoped that the suggestion will stimulate discussion on the relevance of the many scales and units that are used. (Author/BB)

Describes how 30-gram balloons can be used to obtain cloud heights and determine winds aloft. Plans for constructing a workable theodolite inexpensively from common materials are also included. (HM)

Describes a college student chemistry laboratory experiment that illustrates the construction of a polarimeter from inexpensive, readily-available materials. (HM)

Presents 12 amendments to the second edition of Safety in Science Laboratories. Covers topics such as regular inspection of equipment, wearing safety glasses, dating stock chemicals, and safe use of chemicals. (MA)

This issue is designed to give information on pollution control equipment, monitoring instruments, engineering services including analytical testing services, chemicals, and laboratory supply houses. Entries are in alphabetical order within each of the seven sections. The address and phone numbers of each company are included. (MA)

Describes the principle of the scanning optical microscope and explains its advantages over the conventional microscope in the improvement of resolution and contrast, as well as the possibility of producing a picture from optical harmonies generated within the specimen.

Discusses the adaptation of some familiar equipment for use in physics demonstrations: demonstrating waves using a folding slinky, measuring the partial pressure of water vapor, lengthening the time constant on a rate meter, measuring "g" with a phonograph turntable, and constructing a cheap signal generator. (GA)

Describes a device for converting LED digital displays to large-scale displays. (SL)

Describes a device to detect flooding by broken water apparatus and to properly shut off the apparatus and water flow. (SL)

Describes the modification of a transistor radio to make an audio oscillator. (SL)

Describes a method of making simple transmission gratings by photographing the interference fringes generated by an interferometer. (SL)

Reviews use of the celestrial sphere and planisphere to teach variations in the observed motions of the sun and stars. (SL)

Describes a recording gas microvolumeter constructed to carry out sensitive studies of the kinetics of photodecomposition of water. (SL)

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)