Nikola Tesla quits working for Edison in 1885 when tesla inquired about the payment for his work edison replied, Tesla, you don't understand our American humor," thus breaking his word. Earning US$18 per week, Tesla would have had to work for 53 years to earn the amount he was promised.
During the initial years of electricity distribution, Edison's direct current was the standard for the United States and Edison was not inclined to lose all his patent royalties. he also showed that his power lines were better and he demonstrated that by getting cats and shocking them to death with edisons power.
Nikola Tesla begins experimenting with X-Rays In April 1887, Tesla began investigating what would later be called X-rays using his own single terminal vacuum tubes (similar to his patent #514,170). This device differed from other early X-ray tubes in that it had no target electrode. he would stop using it because he became afraid of the X-rays and just left it so he didn't get full credit for doing that