Note 671 — VANES. WEATHERCOCKS.
William Johnston translation
Varro De Re Rust. iii. 5. 17. Our common weathercocks and vanes, when well made, and preserved from rust, show the point from which the wind proceeds, but do not tell their names. By the vanes on church steeples, one knows that our churches stand in a direction from east to west, and that the altar is placed in the eastern end. On other buildings an arrow, which points to the north, is placed under the vane.