Nikola Tesla is best known for his work with electricity, but he was also interested in Roentgen rays, better known today as X-rays. Collected here are his eight essays on Roentgen rays. Tesla has been called the most important man of the 20th Century.

On Roentgen rays -- On Roentgen rays the latest results -- On reflected Roentgen rays -- On Roentgen radiations -- Roentgen ray investigations -- Roentgen rays or streams -- On the hurtful actions of Lenard and Roentgen tubes -- On the source of Roentgen rays and the practical construction and safe operation of Lenard tubes.