now ceiver and listen for the maintains stations at Chi- message transmitted. cago, Michigan City, Milwau- The recent developments in kee, Toledo, and Cleveland, the Great Lakes experiments all with towers of suitable include the invention of a height to carry the antennae, Portable radio-telephone… … Dr. Lee De Forest, Inventor of the radio-telephone, in his Portable radio-telephone for com- less telephone introduced sev- municating over short distances. laboratory. (Gont. on page eral improve- ments which IMPROVEMENTS IN TEE DE F0BE6T SYSTEM OF WIEELE8S TELEPHONY.
Feet · Patents · Apparatus · Tube · Device · War department · Scientific American · Great lakes · Front edge · Sea speed · Metal ties · American june · Los angeles · Typewriting machine · White star
Internet Archive · Public domain (published before 1931). Free to use for anything.
