I think, if it were ever possible for all the facts to come out...we would all recognize that CBM was more influential than WE thought...but that is not to say he was more influential than MERION thought. Tom Paul makes an interesting suggestion about correcting what is in the Merion history books...what is in the Merion history books regarding CBM? What if it already acknowledges his role in full? I wouldn't expect it agrees with David's..."CBM was calling all the shots...", but it may well recognize the full scope of what we can agree on.
TEP
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The 1976 history written by Richard Heilman starts by quoting HW Wind comparing Wilson to CBM. Wind says it is debatable whether CBM understood some of the fundamental principles of modern architecture as well as Wilson. After the Wind quote, the history continues:
"Actually Macdonald & HJ Whigham of NY gave advice and assistance so Merion had the benefit of their experience was well as the skill of their own committee. Hugh Wilson wrote in 1916 about the problems laying out a golf course and stressed the advice received from Macdonald & Whigham"
There is no mention of the existence of CBM's pet features or holes in the original course.
The more recent history written by Desmond Tolhurst has a slightly different take:
"In 1910, the Committee decided to send Hugh Wilson to Scotland and England to study their best courses and develop ideas for the new course. Before he left, he visited the site of the NGLA, America's first modern golf course, then under construction in Southampton, NY. While there he discussed an itinerary with CBM, the designer of the National and winner of the first US Amateur in 1895. Macdonald made a similar journey for the same purpose some eight years earlier. Wilson spent seven months abroad...When Wilson returned from England, both Macdonald and his son-in-law HJ Whigham freely gave him their advice. So the Club has the benefit of their experience as well as the skill and knowledge of the committee"
Tolhurst's history acknowledges the existence of the Redan and Valley of Sin, but goes on to say, "It has been said that Hugh Wilson grasped these principles of Scottish and English course design and conveyed them in his work better than Charles Blair Macdonald did. However, to compare Merion to the NGLA is somewhat of an 'apples and oranges' proposition. CBM set out to 'model each of the 18 holes (at the National) after the most famous holes abroad,' that is, to duplicate those holes. Wilson never intended to design Merion under such constraints. His objective was to build a course that would rival the finest British parkland course in beauty and shot values."