Tesla was a smart guy, but there were others
In 1936, Zuse made a mechanical calculator called the Z1, the first binary computer. Zuse used it to explore several groundbreaking technologies in calculator development: floating-point arithmetic, high-capacity memory and modules or relays operating on the yes/no principle. Zuse’s ideas, not fully implemented in the Z1, succeeded more with each Z prototype.
In 1939, Zuse completed the Z2, the first fully functioning electro-mechanical computer.
http://inventors.about.com/library/weekly/aa050298.htm
and in 1937 - Iowa State Colleges John Vincent Atanasoff and Clifford Berry begin work on creating the binary-based ABC (Atanasoft-Berry Computer). Considered by most to be the first electronic digital computer. An interesting side note, these fellows were HAM operators. didahdidahdidah.
http://www.computerhope.com/history/190040.htm
And in 1939 George Stibitz completes the Complex Number Calculator capable of adding, subtracting, multiplying and dividing complex numbers. This device provides a foundation for digital computers.
Then things start to get busy...
Yes, but Tesla was working decades ahead of these others.
Hey thank You.