Neurologist, headache doctor, GME senior associate dean, physician-historian at Mayo Clinic. Husband, dad, old medical book collector. Tweets mine.
2. After Erb & Westphal described muscle stretch reflexes in 1875, chest percussion hammers were used to elicit reflexes. This is a Vernon percussion hammer, the precursor of the Queen Square reflex hammer. This one was made by Whitelaw (Aberdeen, Scotland). 