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American Ethnographic Film and Personal Documentary is a critical history of American filmmakers crucial to the development of ethnographic film and personal documentary. The Boston and Cambridge area is notable for nurturing these approaches to documentary film via institutions such as the MIT Film Section and the Film Study Center, the Carpenter Center and the Visual and Environmental Studies Department at Harvard. Scott MacDonald uses pragmatism's focus on empirical experience as a basis for measuring the groundbreaking achievements of such influential filmmakers as John Marshall, Robert Gardner, Timothy Asch, Ed Pincus, Miriam Weinstein, Alfred Guzzetti, Ross McElwee, Robb Moss, Nina Davenport, Steve Ascher and Jeanne Jordan, Michel Negroponte, John Gianvito, Alexander Olch, Amie Siegel, Ilisa Barbash, and Lucien Castaing-Taylor. By exploring the cinematic, personal, and professional relationships between these accomplished filmmakers, MacDonald shows how a pioneering, engaged, and uniquely cosmopolitan approach to documentary developed over the past half century.

The desire to improve the performance of gas turbine engines has led to higher operating temperatures in the turbine sections of the engine. Materials used for hot section turbine blades and vanes are not resistant to hot corrosion, and therefore require protective coatings. This paper reviews the current art and technology of thermally sprayed MCrAlY and TB coatings onto hot section components. The issues in applying such coatings will be discussed, along with references to manufacturing issues on the shop floor. The difficulties inherent in applying a line-of-sight coating to complex geometries will be discussed. The testing, evaluation, and performance characteristics of typical coatings are discussed.

The principles underlying composite material behavior during metallographic preparation of coating cross-sections are generally not well understood. This study of the effect of extended fine polishing on apparent porosity shows that adequate polishing times, using a fine abrasive (3 mu m) and low force, are required to remove prior deformation in the section surface and to reveal the true porosity of the underlying composite material. Insufficient polishing times can result in considerable underestimation of porosity. A model is described which proposes that the deformation induced in the material during grinding and polishing, even at low applied force, results in smearing of material into voids that exist in the plane of the section.