RBF Definitions
"In the event called ‘diesel ship-at-sea’
The action of the ship’s propeller
Has a thrust pattern
To which the ship reacts by moving forward,
Which also results, secondarily,
In the ship’s bow elevated wave
Which wave disturbances of the water
Are separate from the propeller’s thrust wave.
Ships appear to be so solid
That they negate human perception
Of their minute longitudinal contraction,
Which occurs initially as a consequence
Of the interaction of the ship’s inertia
With the propeller’s thrust.
This contraction
And its subsequent expansion
Could be observed in yesterday’s
Loosely coupled railway trains,
As they jerkingly accelerated or stopped."
