Principles And Practice Of Telephony: Home Study Course In Telephony (4 Volumes); 1) Principles And Apparatus; 2) Circuit Elements And Power Plants; 3) Circuit Refinements And Mechanical Switching; 4) Toll Equipment, Traffic And Trunking Mitchell, Jay G. Technology

A series of manuals which make up a Home-Study course in Telephony for aspiring telephone technicians during the 1920s. Missing Volume 5. Volume 1 and 2 are second printings, volumes 3 and 4 are third printings. 7 1/2 x 5 inches. Maroon cloth with titles debossed on front board. Author's name, title of series, title and publisher in gold gilt to spine, double-ruled in gold gilt. Index at rear. Diagrams throughout,with foldout diagrams at back of volume 2. Shelf wear and a bit of rubbing to extremities, On several volumes, hinges just started (webbing showing), but still very solidly bound, and sound. A few stray bracketed paragraphs in pencil, and pencil scribbling to rear free endpaper. Previous owner's name to front free endpaper (Everette M. Disney), stating his association (Wire Chief was his position) with the Osage Valley Telephone Company, of Humansville, Missouri. Missing Volume 5 - MECHANICAL MANUAL SWITCHING. ".The intention, throughout, has been so to present the subject so as to make it easy for any . man engaged in telephone work to acquire a thorough knowledge of principles . no matter how limited . his previous acquaintance with the subject may be." (Preface).