[GreenKeys] Aggregate motion??

[Jim Haynes]

What it means is that one bit of the character moves the type box one
position.  Another bit moves it two positions, another four, and so on.
So the total motion is the aggregate of all the contributions of the
individual bits.  The same idea was used in the MITE printer and in the
IBM Selectric typewriter.  In the case of the 37 it also means that the
type box is not returned to a home position after each character, but
simply moves to the next position when the next bits are set up.