A fixed parabolic mirror creates a variously shaped image of the sun as it moves across the sky.
22.
The telescope's 50-foot-wide parabolic mirror gathers and focuses submillimeter-wave radio signals emitted by warm celestial objects, including gas clouds.
23.
Strings of signal-stations in prominent locations would transmit messages using parabolic mirrors during the day and fire by night.
24.
These manuscripts not only describe methods for making mirrors and parabolic mirrors, but also their use for image projection.
25.
In its ultimate electronic form, the photophone receiver used a simple selenium cell at the focus of a parabolic mirror.
26.
The receiver is a tube positioned directly above the middle of the parabolic mirror and filled with a working fluid.
27.
The rare catoptrics lighting system, made up of Argand oil lamps and parabolic mirrors of polished silver, is on display.
28.
They are cheaper to produce than parabolic mirrors, and they are smaller, allowing more reflectors to be installed in less space.
29.
A SCM may be made as a single-piece parabolic mirror or assembled with a number of smaller mirrors in parallel rows.
30.
Melosh suggests exploring other options, and favors positioning a giant parabolic mirror made of reflective fabric material near the threatening asteroid.
