Many think that the device known as "camera
obscura" has only historical significance. In a
message from a friend I see that he uses this
device to map the distribution of soft X-rays
(about 1.5 keV) over the surface at which they
are emitted. Here is the quote:
". . . camera-obscura (objective diameter 0.3mm)
with fixing the X-ray emission onto the X-ray film and
nuclear emulsion . . . " I will write more about these
strange X-rays in a unit at my web site devoted to
cold fusion. By the ways, unit #98 on that site:
is about cold fusion experiments performed by
students at Portland State University. Can
somebody give other examples of using a
pinhole camera in research today?
Ludwik Kowalski