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 ...
AN event of considerable interest was the opening by H.R.H. the Duchess of York on July 5 of the new Sheffield Radium Centre. It may be mentioned that the Royal Infirmary has been a National Radium ...
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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