Describes the use of pieces of equipment such as the Oxygen Temperature Probe (OTB) commonly used by fisherman, for research field trips. The instrument can be used in classroom experiments as well. Other equipment described includes the electronic thermometer and oxygen monitor. (EB)

Describes how to construct an isothermal calorimeter and lists typical results of a displacement reaction using zinc. (LS)

Lists changes which have been made in second edition and explains the philosophy upon which the alterations were based. (CP)

Discusses the principle of operation of phase-sensitive amplifiers. Gives three examples, suitable for undergraduate laboratory use, of the use of phase-sensitive, or "lock-in" amplifiers. Concludes with a description of an inexpensive lock-in amplifier which has an overall voltage gain of 1000. (Author/MLH)

Presents information on a centrifugal force apparatus, signal averaging with a minicomputer, and the use of an air track. (MLH)

Presents a three-step model of English teaching at the Gesamtschule and lists the requirements for achieving the goals of each step in relation to the lay-out and technical equipment of the learning area. (Text is in German.) (IFS/WGA)

Paper describes a method of estimating the theoretical area of undergraduate laboratories and associated ancillary accomodation required by departments in relation to specific levels of student enrollment and course teaching structures. (Author)

A questionnaire was mailed to 50 major chemistry departments, 112 smaller chemistry departments, and 25 chemical engineering (CE) departments. The survey (included in an appendix) consists of a series of questions on two broad subjects--the current inventory at the surveyed institutions and the needs for instrumentation. Responses were received…

The determination of the thickness of a sludge blanket in primary and secondary clarifiers and in gravity thickness is important in making operational control decisions. Knowing the thickness and concentration will allow the operator to determine sludge volume and detention time. Designed for individuals who have completed National Pollutant…

Briefly describes a number of laboratory and instructional materials that are commerically available and of interest to engineering educators. (JR)