Design Parameters of Paraboloid-Hyperboloid Telescopes for X-ray Astronomy.

We have evaluated the principal optical characteristics of paraboloid-hyperboloid x-ray telescopes by a ray-tracing procedure; we find that our results for resolution, focal plane curvature, and finite source distance effects may be approximated in terms of the design parameters by simple empirical formulas.

Wolter-schwarzschild telescopes for x-ray astronomy.

The resolution of a Wolter-Schwarzschild telescope is intrinsically superior to the resolution of the corresponding paraboloid-hyperboloid telescope. The improvement is important for high resolution and wide field telescope designs having grazing angles larger than about 1.5 degrees .

X-ray photographs of the sun on March 7, 1970.

The Sun was photographed from an Aerobee rocket by means of equipment responding to the wavelength interval 3-60 angstroms, revealing interesting relationships between structures in the corona.

Orthogonal Mirror Telescopes for X-ray Astronomy.

Crossed mirror telescopes are presented as an alternative to the present telescope systems used in x-ray astronomy. These instruments generally have a higher x-ray collecting efficiency but a poorer angular resolution than the more conventional paraboloid-hyperboloid telescopes. They also can be made more easily and quickly as was demonstrated by a recent rocket flight that used a simplified mirror design with only one-dimensional focusing.