CRANV1P1 Formation of Index Languages chapter Cyril Cleverdon Jack Mills Michael Keen Cranfield An investigation supported by a grant to Aslib by the National Science Foundation. Use, reproduction, or publication, in whole or in part, is permitted for any purpose of the United States Government. -76 - E64 E65 E66 E67 E68 Compressor Centrifugal + Radial flow compressor. + Radial flow turbomachine Axial flow c. + A. c. * A.f. turbomachine Drum construction Disk construction E69 E70 Axial flow compressor blade Naca 65 (12) 10 Blower blade Jumo 004 Single stage compressor Multi stage compressor E71 E72 E73 (etc. - i.e., other kind[OCRerr] of compressor) [Parts ] E89 [Stage ] Q. E90 Stage characteristic E91 S. efficiency + S. performance E92 Cascade losses E93 S. matching (etc. - i.e., other Stage characteristics) [Blade ] F19 Rotor blade F20 Stator blade (etc. - i.e. other kinds of Blade) (Blade characteristics) F35 Blade shape F37 B. curvature (etc.) [Flow phenomena ] F91 Irrotational flow [Rotational flow F92 Inlet whirl F93 Prewhirl (etc.) The first subclasses under Compressor are Kinds of compressor: Centrifugal and Axial flow (based on direction of flow): Single stage and Multi-stage (based on stage numbers) and so on. The synonyms which appear at the concept level automatically sort themselves out (e. g., the three variants at E65) Any categories (generic and non-generic) which refer to a given subclass follow that subclass immediately. So under Axial compressors is found Kinds (Drum construction, Disk construction, Jumo 004) and Parts (Blade) - and a particular kind of axial compressor blade follows that. (N. b. - a clerical error has resulted in the Kind of a. f.c. 'Jumo 004' following the Part, 'Blade' instead of preceding it; such errors did not affect the programming of searches). The Kinds facet is followed by the Parts facet (Stage, Blade, etc. ). The bracketed term Stage followed by 'Q, indicates a term which appeared in one of the questions but not in the indexing of the subset documents; it has been inserted for programming pur- poses. The array of 'Stage characteristic, demonstrates a recurrent problem in the subject field analysed, that of maintaining 'generic' relations in a situation where strict definition of terms would result in an uncomfortably large number of tiny subff[OCRerr]:ets