First Edition. Softcover. 8vo, paged 42-88, illustrated, tables, graphs; G+; grey cover with black print, bump and creasing to lower right corner throughout, slight pencil notation on front cover, back cover has slight creasing along spine edge and blue library stamp at top edge; interior has blue pencil marks on pp. 43, 82-83 and slight spotting on some pages, otherwise clean with clean text; "Reprinted from Proceedings of The Institute of Radio Engineers, Vol. 17, No. 1, January, 1929." Rockville Non-Retail Listings. (Inventory #: 13-440-1293166)
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