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 120
ustable—either in length or in number. Allshould be well muffled for obvious reasons. The types of spark gaps now in use are shown in figs. 52-57. Theonly types now supplied are fig. 52, the synchronous rotating gap, andfig. 57, quenched gap. Fig. 57 illustrates only one form of the quenchedgap. It… … 5 t
