http://www.bartleby.com/173/23.html

Albert Einstein (1879-1955). Relativity: The Special and General Theory.
1920.

"An observer who is sitting eccentrically on the disc
K' is sensible of a force which acts outwards in a radial direction" --
Einstein

http://mcaaron.files.wordpress.com/2008/03/schleich_catapult.jpg
Notice the cup is pointing tangentially.
Nobody is ever thrown off a roundabout radially.
An observer who is sitting eccentrically on a disc is sensible of a force
which acts in a tangential direction.

NEWTON'S FIRST LAW.
Every body perseveres in its state of rest, or of uniform motion in a right
line, unless it is compelled to change that state by forces impressed
thereon.

The lying idiot Einstein doesn't know the meaning of radial.
Proven by experiment!
Proven by peer review!