Robison's Manual of radio telegraphy and telephony for the use of naval electricians (1918)
Robison, S. S. (Samuel Shelburne), b. 1867, United States Naval Institute, Todd, David Wooster, Hooper, Stanford Caldwell · Annapolis, Md. : The United States Naval Institute · leaf 124
and when the positive arc electrode is capable ofconducting away heat rapidly. Water is used as a cooling medium insteadof air, as with a spark transmitter, and to facilitate its application, thepositive (copper) electrode is made hollow. This rapid cooling of the arcplays a very important part in… … Fig. 62.—Arc Arranged for Wireless Telephony. arc is formed in an atmosphere capable of assisting in this cooling, theenergy of the oscillations is vastly increased. The best gaseous conductorof heat is hydrogen, and consequently the best results are obtained in anatmosphere of hydrogen or some…
