Shortly after pulsars were discovered in the late 1960s, Scientific American had an article about the new discovery. I believe the author of the article was not sure whether pulsars were beaming radiation like a lighthouse or pulsating out radiation equally in all directions. Currently, all the scientific literature I have read states unequivocally that pulsars beam like a lighthouse. Was this ever proven experimentally? ... for example, by checking for max amplitude delay consistent with beam rotation at widely spaced terrestrial antennas?
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