"It consists of a windmill sail placed horizontally like that of a smoak-jack, surrounded by an octagon tower... [U]pright pillars are connected together by oblique horizontal boards... at an angle of about 45 degrees... so as to form a complete octagon including the horizontal windmill sail near the top... [T]he wind as it strikes... from whatever quarter it comes, is bent upwards and then strikes against the horizontal wind-sail. These horizontal boards... may... be made to turn upon an axis a little below their centres of gravity, so as to close themselves on that side of the octagon tower most distant from the wind. ...[I]t was found on many trials by Mr. Edgeworth... and by myself, that the wind by being thus reverted upwards by a fixed planed board did not seem to lose any of its power. And as the height of the tower may be made twice as great as the diameter of the sail, there is reason to conclude that the power of this horizontal wind-sail may be considerably greater, than if the same sail was placed nearly vertically..."