With respect to the extent of easements and the mode of their enjoyment, the following provisions shall take effect:—

Easement of necessity.—An easement of necessity is co-extensive with the necessity as it existed when the easement was imposed.

Other easements.—The extent of any other easement and the mode of its enjoyment must be fixed with reference to the probable intention of the parties and the purpose for which the right was imposed or acquired.

In the absence of evidence as to such intention and purpose—