IN reply to Mr. Walter Chamberlain's inquiry (p, 198), it must be borne in mind that spark length is not per se a criterion of the energy delivered to a vacuum tube. The length of spark is more or ...
IT’S not often that cannons get used for target practice. These images show some of the first machines built to emit X-rays, now given a taste of their own medicine. The stark, ghostly quality of ...
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