Ceiling projector

Both mirrors are focused to produce a high intensity beam of light that renders a visible spot on the base of the cloud.

It consists of an arm with a pointer and open sight at one end and a rubber eyepiece at the other.

The arm is mounted onto a curved scale that is marked both in meters and the coded cloud height (feet).

The observer looks through the eyepiece and sets the sight onto the spot projected on the cloud and reads the height from the attached scale.

In the case of fog or blizzard conditions the observer should read the scale where the beam disappears.