All Noun
3 examples (0.00 sec)
  • The telescope has stepper motor drive control with an electrical focusser.
  • As Brodeur adjusted his ray-focusser, the banner of the Prophet burst into bright flame, and went up in a puff of fire. Cited from The Flying Legion, by George Allan England
  • The design uses a spherical primary mirror in place of a parabolic one, with spherical aberrations corrected by sub-aperture corrector lens usually mounted inside the focusser tube or in front of the secondary mirror.