Avesta word for "praise-song" (Bartholomae: "Lobgesang"); that word is not actually attested in any text. The surviving texts of the Avesta, as they exist today, derive from a single master copy produced by Sasanian Empire-era (224–651 CE) collation and recension. That master copy, now lost, is known as the 'Sassanian archetype'. The oldest surviving manuscript ("K1") of an Avestan language text is dated 1323 CE. Summaries of the various Avesta texts found in the 9th/10th century texts of Zoroastrian tradition suggest that a significant portion of the literature in the Avestan language has been lost. Only about one-quarter of the Avestan
The Inventions, Researches, and Writings of Nikola Tesla they are there is life. The Inventions, Researches, and Writings of Nikola Tesla The Inventions, Researches and Writings of Nikola Tesla is a book compiled and edited by Thomas Commerford Martin detailing the work of Nikola Tesla up to 1893. The book is a comprehensive compilation of Tesla's early work with many illustrations. Written in 1893, the book is a record of Tesla's pioneering activities, research, and works. Tesla is recognized as one of the foremost electrical researchers and inventors. At the time of publication, the book was the "bible" of every electrical engineer practicing the profession. The book contains