Morton, Edward Reginald, 1867- · New York : E.B. Treat & Co. · leaf 85
tendto rise in vacuumwith use just asthe X-ray tubedoes, and in other respects arenot entirely satisfactory. Theynearly always allow some of theinverse currents to reach the X-raytube. It will, of course, be understoodthat if we had a purely unidirec-tiona] supply of current for our tubeno… … Fig. 23.Villards Valve Tube. museum of X-ray antiquities.The series spark-gap should always be placed betweenthe positive pole of the coil and the anode, and it is SECONDARY CIRCUIT. 61 worthy of note that a gap so placed has a material effectin increasing the penetrative power of the tube itself.…
