Thanks a lot for this recommendation, Graham. Bert, as I said, that N.Tesla failed must not mean that it could not be successful in a future time. How many decades has it taken before the knowledge of quantum physics became usable, e.g. laser or semiconductor. Or e.g. gravitational waves, which A. Einstein as existent derived from his calculations but at the same time said that they are so weak that we can never detect them.


'14 4/4 graphite grey