A telescope mount (23) facilitates enhanced below the horizon and zenith viewing.
A piston crown (160) of the cylinder is tapered to a zenith coincident with a longitudinal axis of the piston (150).
The zenith adjustment mechanism eliminates the cumulative tolerances inherent in the components of mechanisms of the prior art.
The wide elevation is fixed due to a first antenna (105) being oriented zenithally, and a second antenna (110) being oriented horizontally.
Each imaging means (12) is tilted to capture light from a zenith above the camera.
When the sun is high in the sky, the roof surface can be adjusted symmetrically as a pitched roof.
Used in at least the regions of strongest steam production are ceiling elements (3) in each of which, at the topmost point, is a passageway (8) for the steam created.
Sunlight would form a very bright glare on the rear side of the roller shutter without said groove, whereby said glare would otherwise extend over the vertical length of the roller shutter.
A circularly polarizied antenna having a high gain in the zenith direction and ensuring a good axial ratio over a very wide range.