CURE CYCLE CROSS HATCHING The breaking of large conductive areas by the use of a pattern of the desired signal by an undesired signal. CROSS-LINKING The setting up of chemical links between the molecular chains. CROSS-PLY Any filamentary laminate that is not uniaxial. Same as angle-ply. In some references, the term cross-ply is used to des- ignate only those laminates in which the lamina are at right angles to one another, while the term angle-ply is used for all others. CROSSTALK (1) The undesirable interface caused by the coupling of energy between signal paths. (2) Signal interference between nearby conductors caused by magnetic field effects. CRUCIFORM CONFIGURATION An aerodynamic configura- tion consisting of identical control and stabilization surfaces that are located at right angles to each other around the body of a missile airframe. CRYSTAL, PIEZOELECTRIC A natural substance, such as quartz or tourmaline, capable of producing a voltage when under stress or pressure, or producing pressure when under an applied voltage. Under stress, it has the property of responding only to a given frequency when cut to a given thickness. It is therefore valu- able for transmitters and oscillators whose frequencies range between 500 kHz and 10 MHz. C-STAGE The final stage of the curing reaction of a thermosetting resin in which the material has become practically infusible and insoluble. CUBE-ROOT LAW Cube-root law is a scaling law applicable to many blast phenomena. It relates the time and distance at which a given blast effect is observed to the cube root of the energy yield of the explosion. CUMULATIVE PITCH The distance measured parallel to the axis of the thread between corresponding points on any two threads regardless of whether they are in the same axial plane. CURE To irreversibly change the properties of a thermosetting resin by chemical reaction, e.g., condensation, ring closure, or addi- tion. Cure may be accomplished by addition of curing (cross-link- ing) agents, with or without heat. CURE CYCLE The schedule of time periods at specified condi- tions to which a reacting thermosetting material is subjected in order to reach a specified property level. 81