What is "extention"

Usage examples of "extention".

For nor without great cause, from place to place, with a diligent and iealous examination I did carefully consider the large extention of the inmost intricate braunches, and their proportionate strength and thicknesse, so cunninglie doone, by such an arte, boulde attempt, and continued intent, they were so aptly led out, whether by sowdering, or by the Hammer, or by casting, or by all three, mee thought it an vnpossible worke to make a couering of such a breadth, and so twysted and twyned together.