page 58. "It is mandatory that there be no break or bend in the Delivery Line..."
I understand "Bend" but what does HK mean by "break"?
The basic message is: whatever Delivery Line you choose to use (the means for Tracing a Straight Plane Line), you should Trace a Straight Plane Line.
I would say "bend" refers to a bend in the Geometric Plane Line, if you're using the Geometric Plane Line as your Delivery Line.
"Break" refers to a deviation from your intended Arc of Approach, if you're using the Arc of Approach as your Delivery Line. Since the Arc of Approach is already bent (it's actually curved! Surprise surprise!), we need to come up with another adjective to describe deviations from the intended Arc of Approach. Hence "break".
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