aiiadict@gmail.com wrote:
On Apr 2, 2:32 pm, "Michael J. Mahon" <mjma...@aol.com> wrote:When the photomultiplier was pointed toward an operating TV, the video waveform was visible on the scope, and could be displayed (with some smearing) on another monitor. This same approach, when used with a telescope, can be used to see what TV shows are on in nearby houses, even if the light from the screen is only indirect!That is cool! I'm going to give it a try
In the days before CCD cameras, this was the approach most observatories used for imaging dim objects and measuring their brightness (not pointing at neighbors houses).
Dave...