RENAISSANCE TO THE TWENTIETH CENTURY Fifteenth century saw the advent of specific measurements being made to compare the features of different skulls and head. Leonardo da vinci (1452-1519 AD) was probably one of the earliest people of note to apply the theory of head measurement to good effect in practice. He used a variety of lines related to specific structures in the head to assist in his study of the human form (Fig-1). His drawings included a study of facial proportions in natural head position.
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