Keywords: Life in Motion Fig 40.png en Fig 40 ”Time of making voluntary movements in writing letters Each little wave is the one-two-hundred-and-fortieth of a second Examine with a magnifying glass In the experiment the lines were white on a black ground Life in Motion or Muscle and Nervehttps //archive org/details/b21929786 John Gray McKendrick 1892 1926 Life in Motion book |