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Leonardo. Vol. 8, pp. 249-251. Pergamon Press 1975. Printed in Great Britain The terms defined below were selected from artists’ articles and notes published in the previous issue of Leonardo. Each definition is followed by an indication of the volume and page number of Leonardo on which the term first appears. The terms were not found in the art dictionaries listed in Leonardo 8, 67 (1975) or they are used in a new sense. Some are terms that have been carried over into the field of art from the natural and social sciences, from mathematics and from technology . Numbers in brackets, e.g. [lo, 151, refer to the dictionaries mentioned above. The definitions are not presumed to be unassailable. The Editors would, therefore, welcome the comments of readers on the definitions presented. 626. Abrasive (in technology)-A substance (as emery or pumice) used for abrading, smoothing or polishing. (8, 106; [171) 627. Amoeba, ameba (in biology)-A microscopic single-celled animal found in stagnant water or as a parasite on other animals. It has an indefinite form, putting out rounded arm-like parts for collecting food or for locomotion. [2, 31 (cf. Amoeboid, term 628) 628. Amoeboid (in biology)-Resembling an amoeba (cf. term 627) specificallyin its motion or change in shape. (8, 98; [I711 629. Anisotropic (nonisotropic used in text) (in physics) -Possessing at any point different values of a physical property or of a parameter (e.g. fluid turbulence intensity, refractive index, elasticity, thermal and electrical conductivity ) in different directions. (8, 117; [13, 141) 630. Anode (in electronics)-The electron-collecting electrode of a vacuum tube or valve. [17] (cf. Cathode, term 632, electrode and electron, Terminology, Leonardo 4, 288 (1971) and vacuum tube, Terminology, Leonardo 7, 67 (1974)) 631. Apogee (in astronomy and astronautics)-The point farthest from a planet or a satellite (e.g. a moon) reached by any object orbiting it (cf. term 659). (8, 139; [17]) (cf. Perigee, term 661) 632. Cathode (in electronics)-The electron-emitting electrode of a vacuum tube or valve. [I71 (cf. Anode, term 630) 633. Conic, conic section (in mathematics)-The locus (cf. term 655) of a point that moves in a plane so that the ratio of its distance from a fixed point to its distance from a fixed line is constant. The ratio is called the eccentricity. The resulting curve is an ellipse (cf. term 640),a parabola (cf. term 660) or a hyperbola (cf. term 646) according to whether the eccentricity is less than one, equal to one or more than one. [ll] 634. Cullet (inglass technology)-Broken or refuse glass usually added to the charge batch to facilitate melting in the manufacture of glass. (8, 105; [17]) 635. Desplegables(in visual art)-Term used by E.C.G. Sebastian for small sculptures that he has made of folded paper and cardboard. (8, 148) 636. Diffraction grating (diffraction filter used in text) (in physics)-A transparent or reflecting optical device for dispersing light (or other electromagnetic radiation) into a spectrum. One kind of grating is a transparent plate covered with fine, parallel, opaque, equidistant bands. (8, 142; [ll, 141) (cf. Electromagnetic waves, Terminology, Leonardo 5, 355 (1972) and spectrum, Terminology, Leonardo 7, 166 (1974)) 637. term 633) Eccentricity (in mathematics)-(8, 98) (cf. Conic, 638. Electroluminescent lamp-A thin rigid or flexible sheet light source from one or both sides of which light can be caused to radiate uniformly. Present forms utilize a phosphor (cf. term 662) film sandwiched between two electrically conductive layers. The alternating electric field produced in the phosphor film by the passage of an alternating current through the outer layers causes the phosphors to emit light. (S. Bronz, Lighting in Any Shape, Science News Letrer 76, 176 (Sept. 1959)) (cf. Electroluminescence , Terminology, Leonardo 5, 262 (1972)) 639. Electropainting (in visual art)-Term used by F. J. Malina for an object whose pictorial surface is made of transparent, translucent and opaque materials through which light is transmitted from electric light bulbs or tubes mounted behind the surface within the object. (8, 110) 640. Ellipse (in mathematics)-The locus (cf. term 655) of a point that moves in a plane so that the...

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