Hiram Percy Maxim and Clarence D. Tuska, A Portable Outfit (1916)
“ The outfit consists of a loose coupler, fixed condenser, variable condenser, Galena Molybdenite and Silicon detectors. A three thousand Ohm head set completes the receiving outfit. The sending is comprised of a fixed gap, 2′′ spark coil, moulded condenser, helix, aerial switch, and key which is mounted on the front cover so that it is on a level as is shown. ”
