E. F. Johnson Company Booklet. Guided-Wave Telephony. Material: paper, metal Size: 6 5/8" W. x 9 1/2" L. Description: gray paper cover - black printed information and graphics: "Guided-Wave Telephony" with graphic of The Franklin Institute of the State of Penna. Incorporated 1824 logo - contents: 28 pages stapled to cover along fold includes the above stated article, diagrams. and captions reprinted from the "Journal of the Franklin Institute", March, 1921.