Gullivers Travels by Part 3 Chapter 3 Page 16

This was accordingly done; but the officers employed in that work found the descent much speedier than usual, and by turning the loadstone could not without great difficulty keep it in a firm position, but found the island inclining to fall. They sent the king immediate intelligence of this astonishing event, and begged his majesty’s permission to raise the island higher; the king consented, a general council was called, and the officers of the loadstone ordered to attend. One of the oldest and expertest among them obtained leave to try an experiment, he took a strong line of an hundred yards, and the island being raised over the town above the attracting power they had felt, he fastened a piece of adamant to the end of his line, which had in it a mixture of iron mineral, of the same nature with that whereof the bottom or lower surface of the island