Note 15 — EPISTLE THE THIRD.
Reading edition
William Gilbert, M.D. chief physician to Queen Elizabeth and King James I. He published a treatise, "De Magnete, magnetecisque corporibus, et de magno magnete Tellure Physiologia Nova. London, 1600, folio." This treatise on the magnet is termed by the great Bacon "a painful and experimental work." Gilbert also invented two instruments for the use of seamen in calculating the latitude, without the aid of the heavenly bodies. He died A.D. 1603.