Methods, based on historical techniques, are described which may be used to determine the relative density of irregularly shaped objects of various composition. (TS)

The role of phosphates in environmental issues and in detergents is discussed. Experimental procedures are described for colorimetric determination of orthophosphates. (TS)

Describes and compares procedures and results of determination of colorimetric, potentiometric, and amperometric endpoints of an oxidative titration of arsenite by iodine. (TS)

Briefly describes different designs for college chemistry laboratories to help mobility handicapped students working in them. (SK)

Presents a technique to produce samples for x-ray diffraction studies on the Tel-X-Ometer 80 x-ray apparatus from readily available crystalline powders and discusses observations of transverse modes of an optical resonator. (SK)

The goal was to gain information concerning the appropriateness of each of 70 selected laboratory teaching competencies for inclusion in science teacher education programs and the extent to which students had developed such competencies. Approximately 85 percent of the competency items were viewed as appropriate for beginning science teachers. (MP)

Explored were the effects on student attitudes of autotutorial laboratory instruction in a lower-division life sciences course designed for nonbiology majors at Skyline College, San Bruno, California. Positive results indicate the effectiveness of this mode of instruction in enhancing attitudes of students towards their learning and this…

Described are graphic computer simulations of laboratory experiments in modern physics developed for student use prior to each laboratory and which replace pre-lab briefing. Experimental simulation is intended to familiarize the students with the experiment, and to allow the students to try a larger number of "experimental" combinations of…

Described is the use of the Doppler Effect with microwaves in the measurement of the acceleration due to gravity of falling objects. The experiments described add to the repertoire of quantitative student microwave experiments. (Author/DS)

A magnetic multipole apparatus suitable for the physics teaching laboratory is described. The apparatus enables the student to measure the magnetic field configuration of a single large coil, and of systems of one or more small coils. (Author/DS)

A technique is presented for producing holograms using equipment which is already in the possesion of the majority of college physics departments, which includes a slightly modified Michelson interferometer, a helium-neon laser, and a long focal-length lens. Production of high quality holograms has been achieved by inexperienced undergraduates…

Described is a laboratory experiment in measurement of electrostatic potentials to help students gain an idea of potentials, which will provide a basis for deeper understanding of electricity and magnetism. The theoretical potential in this report is derived by taking into account the boundary of the actual experimental setup. (Author/DS)

Describes a method for constructing undergravel filters made from common materials to provide suitable habitats for a diversity of aquatic organisms. (CS)