To establish elevations with a builder's level, set up the instrument where locations for which elevations are to be determined may be seen through the telescope. Level up the instrument and take a reading on the measuring rod by means of the horizontal cross hair in the telescope. The rod is then moved to the second point to be established. Raise or lower the rod until the reading is the same as the original. The bottom of the rod is then at the same elevation as the original point. To obtain the difference in elevation between two points, set up and level the instrument at an intermediate point. With the measuring rod held on point A, note the reading where the horizontal cross hair in the telescope crosses the graduation marks on the rod. Then with the rod held on point B, sight on the rod and note where the horizontal cross hair cuts the graduations on the rod. The difference between the reading at A and the reading at B is the difference in elevation. To establish points on a line with a transit, level the instrument and center it accurately over a point on the line by means of a plumb bob. Then sight the telescope on the most distant visible known point of that line. Lock the horizontal motion clamp screw to keep the telescope on line, and place the vertical cross hair exactly on the distant point with the tangent screw. Then, by rotating the telescope in the vertical plane, the exact location of any number of stakes on that same line may be determined.