<P> The Crookes tube was improved by William Coolidge in 1913 . The Coolidge tube , also called hot cathode tube , is the most widely used . It works with a very good quality vacuum ( about 10 Pa , or 10 Torr ) . </P>
<P> The Crookes tube was improved by William Coolidge in 1913 . The Coolidge tube , also called hot cathode tube , is the most widely used . It works with a very good quality vacuum ( about 10 Pa , or 10 Torr ) . </P>
who invented the hot cathode x ray tube
who invented the hot cathode x ray tube
William Coolidge
William Coolidge