paraboloidal

The same process can be used to make a lens with a concave paraboloidal surface.

If the surface is paraboloidal, the mirror looks like a doughnut or lozenge.

The mirror is never exactly paraboloidal, but it is always close enough for cooking purposes.

As the tray spins the liquid forms a paraboloidal surface of essentially unlimited size.

A hall sloped upward, vaguely seen in the dull red light from a paraboloidal ceiling.

A paraboloidal shape is precisely the shape needed for the primary mirror of a telescope.

A darker streak, in a horseshoe or paraboloidal shape, surrounds the bright area.

At that point, a variation in polishing strokes is typically used to create and perfect the desired paraboloidal shape.

By placing the container away from the axis, off-axis paraboloidal segments can be cast.

It remains paraboloidal, but its focal length and other parameters change as it tilts.

The container for the liquid is rotating so that the liquid assumes a paraboloidal shape.

The rotating liquid assumes the paraboloidal shape regardless of the container's shape.

When the rotation is stopped, the glass is solid, so the paraboloidal shape of its top surface is preserved.

Although paraboloidal solar cookers can cook as well as a conventional oven, they are difficult to construct.

Paraboloidal reflectors that have their centres of mass coincident with their focal points are useful.

It consists essentially of a resonant vessel, usually of paraboloidal form, closed at one end by a flexible membrane.

Paraboloidal or dish - The reflector is shaped like a paraboloid truncated in a circular rim.

All the heliostat mirrors send accurately parallel beams of light into a large paraboloidal reflector which brings them to a precise focus.

Paraboloidal reflectors generate high temperatures and cook quickly, but require frequent adjustment and supervision for safe operation.

If the material solidifies while it is rotating, the paraboloidal shape is maintained after the rotation stops, and can be used to make a reflector.

It is possible to use two parabolic troughs, curved in perpendicular directions, to bring sunlight to a point focus as does a paraboloidal reflector.

However, solar cookers that concentrate sunlight, e.g., those with paraboloidal reflectors, do produce high temperatures which could cause injury or fire.

This rotation technique is sometimes used to make paraboloidal mirrors for astronomical telescopes, and has also been used for solar cookers.

The "gereformeerde kerk" with its paraboloidal roof was built in 1925, based on the design by architect W. van Straten.

In 1909, Wood constructed the first practical liquid mirror astronomical telescope, by spinning mercury to form a paraboloidal shape, and investigated its benefits and limitations.