law: Indian Easements Act, 1882
  5. Continuous and discontinuous, apparent and non-apparent
  
  easements
  Easements are either continuous or discontinuous, apparent or
  
  non-apparent.
  A continuous easement is one whose enjoyment is, or may be,
  
  continual without the act of man.
  A discontinuous easement is one that needs the act of man for
  
  its enjoyment.
  An apparent easement is one the existence of which is shown by
  
  some permanent sign which, upon careful inspection by a competent person, would
  
  be visible to him.
  A non-apparent easement is one that has no such sign.
  Illustrations
  (a) A right annexed to B’s house to receive light by the windows
  
  without obstruction by his neighbor A. This is a continuous easement.
  (b) A right of way annexed to A’s house over B’s land. This is a
  
  discontinuous easement.
  (c) Rights annexed to A's land to lead water thither across B's
  
  land by an aqueduct and to draw off water thence by a drain. The drain would be
  
  discovered upon careful inspection by a person conversant with such matters.
  
  These are apparent easements.
  (d) A right annexed to A's house to prevent B from building on
  
  his own land. This is a non-apparent easement.