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Leonurdo,Vol. 6, pp. 163-164. PergamonP r e s s 1973. Printedin Great Britain TERMINOLOGY The terms definedbelow were selectedfrom artists' articles and notes published in the previousissue of Leonardo. Each definitionis followed by an indication of the volume and page number ofLeonardoon which the term first appears. The terms were not found in the art dictionaries included in the list in Leonardo6,67 (1973)ortheyareusedin a newsense. Some are terms that have been carried over into the field of artfrom the natural and socialsciences,from mathematics and from technology. Numbers in brackets, for example [lo, 151, refer to the dictionaries mentioned above. The definitions are not presumed to be unassailable. The Editors would, therefore, welcomethe commentsof readers on the definitionspresented. 1. Cam (in mechanics)-A rotating piece of irregular shape or an elliptical cylinder adapted to impart a variable or alternating motion to another piece by slidingor rolling contact. (6,21; [3, 141) 2. Coherent (in physics)-Having waves of one wavelengthin phase. (6,2; [15]) (cf.Phase, below) 3. Dynamic-interactive art system;interactive art system-An art system or situation necessarily including an art work and its viewer, but not its maker, in which the art work receives and responds to an input from the viewer. (6,13) 4. Dynamic-passive art system; dynamic art system-An art system or situation necessarily including an art work and its viewer, but not its maker,inwhichtheartworkundergoeschangeswith time accordingto the artists' intentions or program, for example,a mobile or a kineticart object. (6, 13) 5. Holography (in photography)-Light interference photography; the recordings of images of objects in terms of phase and amplitude of light rather than intensity, as in an ordinary photographic image. Coherent light from a laser is split into two beams, one of which illuminatesthe object to be recorded. The reflected light from the object and the other beam are recombined on a photographic plate to form a light interference pattern. Theresultingphotographicrecord (hologram)when viewedin coherentlight,suchasthat usedinmaking the recording,causes a three-dimensionalimage of the object to be seen. (6, 1; [lo]) (cf. Coherent, above, and hologram,Leonardo 5,169 (1972)) 6. Hypercube (in mathematics)-A three-dimensional section of a four-dimensionalmathematical equivalentof a cube. (6,6) 7. Microswitch (in physicsjA small, highly sensitiveelectricalswitch (6,21) 8. Microwave (in physics)-An electromagnetic wave whosewavelengthis between one and 100cm. (6,6; [151) 9. Object beam (in holography)-One of two coherent light beams from the same laser used in making a hologram. The object beam is directedat the object to be recorded and is reflected from the object to the holographic plate. (6, 2) (cf. Holography ,above, and reference beam, below) 10. Phase (in physicsj A stage or point .in a periodicmotion,frequentlyspecifiedby the measure of an angle, where the angle of 360" is taken as representative of one complete cycle. Two like periodic motions are said to be out of phase when any phase of one is earlier or later than the corresponding phase of the other. (6,2; [2]) 11. Process or process-oriented art-Art in which the resulting work (in or not in the form of an object)isaffectedby theviewerorviewersduringthe process of its production as specifiedor outlined by an artist. (6, 12) 12. Pseudoscopic (inphotographyjTurned back to front spatially so that the proper depth and parallax are reversed. (6, 6) 13. Pulsed laser (in holography)-A laser that produces successive flashes of coherent light. A pulsed laser is highly advantageousas a light source when a vibration-free holography set-up is impractical . (6,2) (cf. Holography,above) 14. Quadratic (in mathematicsjPertaining to a square; an equation of the second degree (6, 19; [31) 15. Reference beam (in holography)-One of the two coherent light beams from the same laser used in making a hologram. The reference beam is directed at the holographic plate and acts as a carrier of the information in the object beam. (6,2) (cf. Holographyand objectbeam, above) 16. Staticart system-An art system or situation necessarilyincludingan artwork and its viewer,but not its maker, in which the art work undergoes no changes with time intended by the artist, for 163 164 Terminology example, a traditional art object...

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