A woman whose head is attached to a machine which resembles a large hairdryer, but is in fact a Lavery Electric Automatic Phrenometer, for measuring brain activity. (Photo by Topical Press Agency/Getty Images)
A woman whose head is attached to a machine which resembles a large hairdryer, but is in fact a Lavery Electric Automatic Phrenometer, for measuring brain activity. (Photo by Topical Press Agency/Getty Images)