"There seem to be two ways of detailing contours. One uses arrows to signify the contours, the other sections off green with labels (such as A,B,C) and assigns a height relative to a certain zero point."
Paul:
I have no idea who the first was to drawing detailed green contours. I agree that the two methods you described above are all I've ever seen from the old days. Flynn used those arrows all over his greens (Wayne and I call them "flow lines"), and Ross and Alision seemed to use the other method you described.
As for Colt, I've only seen maybe two of his drawings, one for a course in Canada and the other PVGC. In his PVGC drawings the greens were pretty amorphous but he did occasionally have something to say about a few of them which was only text, not drawings. He'd say things like "raise green on left" (#2) although that green wasn't where the 2nd green was built or "raise boldly the right hand edge of green" (#5) or "raise left edge of green" and "ease slope on right edge of green" (#6) or "depress hill at back for occasional hole" (#17) but he never actually got into any green contouring descriptions more detailed or explanatory than that. On the other hand, Alison's green contouring details in 1921 for a few greens at PV were really specific using the A,B,C method.