Flexible tube 3 is filled with identical steel balls 4. One end of tube 3 is attached in fixed cylinder 5 and the other end in fixed cylinder 6. When piston 1 is pushed in to cylinder 6, motion is transmitted to piston 2 in cylinder 5. The centre line of flexible tube 3 between the cylinders may be of various shapes. The mechanism can be used for spatial transmission of motion.
$3483$SFL,4L$