Morton, Edward Reginald, 1867- · New York : E.B. Treat & Co. · leaf 53
ld be made out. Notwithstanding the numerous forms of X-ray tubesthat have been and continue to be placed on the market,they are all made after this plan, which is known asthe focus tube, in contra-distinction to the originalforms in which no attempt was made to produce the raysfrom a single point.… … Fig. 9. Crookes Tube. CATHODE RAYS. 29 We have seen that the first essential for our purposeis the production of a stream of cathode rays with asufficiently long mean free path. It will also be observedthat the cathodal stream is a particulate one—being madeup of the extremely minute particles…
