Instructions are provided for the construction of 4.5 foot diameter planetarium shells. (CP)

This is part I of a report on a study comparing reel and cassette tapes for signal-to-noise ration, total harmonic distortion, dynamic response, frequency response, bias and virgin noise and oxide coating uniformity. Test equipment and procedures are described and results are discussed. Charts detail research findings. (CHK)

This is a questionnaire to be filled out by any institution having at least one sound recording in an uncommonly taught language. The questionnaire will be used in the second of a series of inquiries designed to facilitate information exchange among members of NALLD. (AM)

Stresses the importance of language laboratories and other technical devices used in foreign language teaching, particularly in programed language instruction. Illustrates, by means of taxonomies, the various stages a foreign language learning program should follow. (Text is in Spanish.) (DS)

Presented is a discussion focusing on teaching radioactivity in the schools. The author suggests equipment available and experiments that can be performed. (PEB)

Describes four experiments designed to introduce students to the methodology associated with the construction, evaluation, and use of ion-selective electrodes. (SLH)