Design
A horse collar is oval rather than circular and it is by design not very flexible. It is a padded appliance that conforms well to the shape of the horse's body. It is constructed so that at all points of contact with the body of the horse it avoids the air passage. By protecting the airway of the horse it became possible for the animal to use its full force to pull a load.
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—Freeman Dyson (b. 1923)
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—François, Duc De La Rochefoucauld (1613–1680)