Funktion, Eigen- 



107 



Fütterungsstoff 



Bessel function of the first kind. 

 Eigen- eigen function, charac- 

 teristic f. Einheits- unit func- 

 tion (of heaviside). Hyperbel- 

 hyperbolic function. Kraft- 

 power function. Kugel- spherical 

 function. Orts- position function. 

 Kinkel- trigonometric function, 

 angular f., function of angles. 



Funk-triJbung uncleared zero, blur- 

 ring or lack of precision of mini- 

 ttuiii or zero (in radio d.f. or 

 bearing), -verkehrsbezi rk radio 

 controlled aerial navigation (or 

 avigation) district or zone. 

 -Wechsel sprechen alternate two- 

 way radiophone communication. 

 -wesen radio technology, r. sig- 

 naling art. 



Furche furrow, channel, wrinkle, 

 ruling or line (of diffraction 



grating); groove or track (with 



undulations, of phonograph or 



gramophone disk). 

 Fuss pinch, press, squash, stem or 



foot (of a lamp, tube or valve). 



-.umgestülpter re-entrant squash 



or press. Strahl erzeuger- gun 



press (of c.-r. tube). 

 Fusskreis root line, dedendum 1, 

 fusslose Röhre loctal tube. 

 Fussplatte base plate (camera). 

 FussDunkt foot (math.), nadir 



(point opposite the zenith, in 



astronomy). -»Gegen- anii- 



pode. 

 Fusspunkt-kurve pedal (or podal) 



locus curve, -linie podal line. 



-widerstand terminal impedance 



or base-loading (of antenna). 

 Futter, Mantel- shell lining, 

 Fütterungsstoff lining material. 



