Which two individuals are recognized for classifying practical transmitting antennas?

The classification of practical transmitting antennas is primarily attributed to Heinrich Hertz and Guglielmo Marconi. Hertz is well-known for his pioneering work in electromagnetic wave propagation, which laid the foundation for radio communications. He demonstrated that electrical energy could be transmitted through space in the form of radio waves, which are fundamental to the operation of antennas.

Marconi, on the other hand, took these principles and successfully developed practical applications for wireless communications, including the commercial use of radio, by designing and constructing effective antennas for transmitting signals over long distances. Their collective contributions have been monumental in the advancement of radio technology and telecommunications.

The other options represent notable figures in different fields or contexts. While Einstein and Newton contributed significantly to physics and our understanding of the natural world, their work does not focus on antennas or telecommunications. Faraday and Tesla are primarily recognized for their contributions to electromagnetism and electrical engineering, which, while related, do not specifically pertain to the classification of transmitting antennas. Fleming was known for his work in electronics and the development of the vacuum tube, and Alexander Graham Bell is famous for his invention of the telephone, not antenna technology. Thus, Hertz and Marconi are the most relevant figures in the context of classifying practical transmitting antennas.