The book of Hans Gunther (already known in the USSR from the book Wireless Telegraphy in the publication of the State. Ed. ed. Prof. V.K. Lebedinsky) and Dr. Franz Fuchs (deputy pres. Munich radio club), which also publishes one of the most popular radio magazines in Germany, "Radio fur Alle," seems to be most satisfied with a wide circle of radio amateurs, as can be judged by the unprecedented circulation of the book: in October 1923, the first 10,000 were released, until mid-March sold 55,000 copies, and in the month of April another 20,000 copies were released.