Three identical flat disks whose thickness T<<<D , the diameter, are arranged with their axes of rotation mutually perpendicular, are calibrated in a stationary frame such that the three total number of revolution counts are exactly the same. Each revolution of each disk is counted by a separate high memory content Chinese Abacus. To each axle of rotation is a feedback motor control used to correct for friction losses only, as measured by measuring revolution count differences in each disk. The control systems are independent of each other. Or, replace the system above with frictionless spinning disks, at a slightly greater cost. On sale, this week only! "Friction < 0" SuperGrease. Accelerate the frame containing the spinning disks along an axis parallel to one of the axes of rotation to some constant velocity. Keep a running count of the total revolutions, A, B and C, of each disk and simultaneously measure the |error|, differences in current total number of revolutions, A, B and C, of each disk as each error is expressed as: a. |A - B| ?= b. |B - C| ?= c. |A - C| ?= What are each "?=" in terms of >0, <0, or =0? You select the axis parallel to the direction of motion. Explain: Confirming Rumor: Einstein replaced the mechansim of mechanical clocks with atomic clocks re SR. Can anyone verify this rumor? If yes, is AE's reasoning ever explained by him, or anyone else? If yes, what was the stated reasoning?