guter Zustand, Gebrauchs- und Alterungsspuren: ehemaliges Bibliotheksexemplar mit Rückenetikett, Etikett mit Folie überklebt bis weit in beide Buchdeckel hinein - Titel mit Stempeln und Notizen - Deckel innen mit angeklebtem Papierrest - Umschlag leicht verschmutzt und etwas vergilbt - Seiten aber sauber und ordentlich, The Effect of Vibrations (Sonic and Subsonic Frequencies) during the Period of Solidification on the Mechanical Properties of Castings of Gas Turbine Materials with Special Reference to H. R. Crown Max and Nimonic C. 75 Summary "Test castings were designed to produce data which would help in the production of gas turbine blades as castings. For castings in H. R, Crown Max the investigation is limited to the effect of sub-sonic frequencies and range of amplitudes; but in the experiments conducted an Nimonic C. 75, both sub-sonic and sonic ranges of frequency were investigated. It can be concluded that certain frequencies notabiy improve the quality and properties of castings. This effect is attributed to the formation of more uniform and smaller crystals during this process, and to an increase in density.", Halbleinen, ca. 20,5 x 27,5, 26 Seiten und 16 Bildtafeln