Spherical reflectors were introduced in about 1780 and parabolic reflectors about ten years later.
"Artificial Light" by M. Luckiesh
They can be reflected by plain sheets of metal, concentrated by parabolic reflectors, refracted by prisms, concentrated by lenses.
"Scientific American Supplement, No. 717, September 28, 1889" by Various
As our marine increased greater skill was invoked, and lamps reinforced by parabolic reflectors poured their light upon the sea.
"Fragments of science, V. 1-2" by John Tyndall
Camol left the laboratory and returned with a large coil on the top of which was mounted a parabolic reflector.
"Astounding Stories, August, 1931" by Various
Parabolic reflector Reflecteur parabolique.
"English-French and French-English dictionary of the motor car, cycle, and boat" by Frederick Lucas
A type of parabolic reflector now in use is shown in fig.
"Encyclopaedia Britannica, 11th Edition, Volume 16, Slice 6" by Various
Microstrip reflectarray antennas promise to provide the best features of printed phased-array and parabolic reflector antennas.
Extend Your Wi-Fi Range With a Parabolic Reflector.
Extend Your Wi-Fi Range With a Parabolic Reflector .
It uses a 250W discharge lamp lightsource and features a high luminous parabolic reflector, CMY color mixing, a color wheel with 6 dichroic filters and open, dimmer, and near-silent cooling fans.
XR9 Spot is a moving head projector with a 575W discharge lamp (MSR 575/2) combined with a dichroic parabolic reflector that yields a light efficiency of 9,300lux at 5m.