the left, there is a book "Practical
Wireless Telegraphy" by Elmer E. Bucher (New York,
the right, there are two German books with the same title "Die Funktelegraphie"
("Radio Telegraphy"). Those are the 1st and the the 3rd
editions of the same book by H. Thurn issued in
Leipzig and Berlin in 1907 and 1915 respectively. We also
have the 2nd edition of this book
printed in 1913.
between the books there is a home-made composition on
display consisting of Loewe-Radio 3NF
"multi-purpose" vacuum tube and a pair of
vintage coils that served antennas in broadcast radios of
3NF "multi-purpose" tube contained
three triodes, four resistors and two capacitors all in the
same vacuum space. Introduced in 1926, the 3NF
was in fact world's first integrated circuit (not a
"micro chip" though).