NATIONAL RADIO INSTITUTE — Iron Core A.F. And Power Transformers

Washington D. C.: National Radio Institute, 1931. Revised Edition. Stapled wraps. B&W Illustrations; This is a trade sized paperback book with cardstock covers and a stapled spine. The book is in Very Good+ condition and was issued without a dust jacket. The front cover of the book has some ground-in dirt and creasing. The text pages are clean and bright with the exception of some finger dirt and ground-in dirt to the contents page, and occasional spots of foxing throughout. "The National Radio Institute-McGraw Hill Continuing Education Center was a private post-secondary for-profit school, specifically a correspondence school, based in Washington, D. C, in business from 1914 to 2002. It originally trained students desiring to become radio operators and technicians. In 1922, the term "radiotrician" was coined for NRI graduates and registered with the U. S. Patent office in 1928. NRI conducted its training courses through mailed lessons, a form of asynchronous learning. The first such home-study courses NRI offered were in radio repair (transmitters and receivers) and radio telegraphy & telephony. These courses were designed to be comprehensive, covering all facets of radio technology, including: radio operation, broadcasting, manufacturing, sales, and service.". Very Good+ .