6th observation 4 feet 6 inches. 3rd observation 2 feet 6 inches. 3rd observation 2 feet 2 inches. 2nd observation 2 feet 2 inches. 5th observation 3 feet 2 inches. 2nd observation 2 feet 10 inches high. The position of the wires.[14] [Illustration: FIG. 76.--The brushes of the.