Page:Transactions of the Geological Society, 1st series, vol. 3.djvu/399

 that of determining the position of strata. The contents of a solid contained by planes may be determined from the dimensions and relative positions of these planes, and for ascertaining the latter the clinometer may be used, where great accuracy is not wanted. Mr. Jardine has used it in gauging a pond, of which the sides were pretty regular slopes. By having the end of the button of the central axis and the bottom of the milled head screw so adjusted by grinding, that they may be in a plane parallel to that of the base of the quadrant, he has made the quadrant useful in supplying the place of a common spirit level upon many occasions.