goniometer
n.
5prec. + 3METER6
1 an instrument for measuring angles, esp. of solid bodies
2 Radio an electrical device used to determine the direction or angle of signals coming from a transmitting station

Not to be confused with the gonophone a marvelous electronic diagnostic device of the early 1940s.
It was a marvelously sensitive microphone incorporated in a urethral catheter, connected to an
amplifier and headphones. When introduced into the genitral tract, every time it got close to a
gonococcus, a physician with heagphones on could hear it go "Clap,clap!"