Produced by Robert Cicconetti, Tim Madden and the Online Distributed Proofreading Team at https://www.pgdp.net (This file was produced from images generously made available by The Internet Archive/American Libraries.) [Transcriber's Notes All apparent printer's errors and variations in spelling have been retained, there are also some inconsistencies in the hyphenation of words. All these have been detailed at the end of the text. There are a number of mathematical equations in the text, these have been rendered into a text representation that attempts to make them as clear as possible while matching the text as closely as possible. Multi-line fractions have been rendered on one line with the addition of extra brackets if required to ensure clarity. Superscripts are denoted with ^ followed by the superscripted term in {}. Subscripts are denoted by _ with the subscripted term in {}. Square roots are denoted by [\sq] followed by the rooted term in {}. Some equations have following punctuation, both commas or full stops, in the original text as though the equation is part of the sentence. The middle dot has been used in the original text, both as a multiplication symbol and as a decimal point. These have been kept but the middle dot as a multiplication symbol in formulae is surrounded by single spaces. Italicised text in the original text is represented by _text_, bold text is represented by =bold=.] * * * * * HERTZIAN WAVE WIRELESS TELEGRAPHY. BY DR. J. A. FLEMING, F.R.S. [From the POPULAR SCIENCE MONTHLY, June-December, 1903.] * * * * * [From the "Popular Science Monthly," June, 1903.] HERTZIAN WAVE WIRELESS TELEGRAPHY.[1] BY DR. J. A. FLEMING, F.R.S., PROFESSOR OF ELECTRICAL ENGINEERING, UNIVERSITY COLLEGE, LONDON.