Was Mrs. Barnes a self-serving informer?
Mr. McGurrin wrote "Typewiting without looking at the keyboard"
Without looking at..
McGurrin wrote like it's impossible to achieve this method on the double keyboard machines of those days, like Caligraph or so on.
Mrs. Barnes wrote a textbook for typing, and she quoted McGurrin but didn't quote the mentioning about Caligraph. In addition, she didn't stop to try touch-typing on Caligraph. Also she seemed to bend the definition of touch-typing as something strange: