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Slope Stakes
Figure 15-38.Using a Jacobs staff with a hand level.

Equipment Operator Basic - Beginning construction equipment operators manual
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LEVELING  EQUIPMENT To set, use, and compute grade stake measure- ments,  you  must  be  able  to  measure  the  vertical distance from one point to another. This process is called leveling and is accomplished by using leveling equipment. A level  is  an  instrument  used  for  measuring vertical  distances.  All  levels  have  a  line  of  sight  with a bubble device for maintaining the instrument in a horizontal   plane. Levels   vary   in   their   accuracy Figure  15-36.—Finish  grade  stake. according to the quality and magnification power of the  lens. Vertical   distances   are   actually   measured   by sighting on a graduated rod, called a  level rod. Like other  surveying  equipment  used  for  measuring distances, level rods usually are graduated in feet, tenths,  and  hundredths. HAND  LEVEL The hand level is generally a round metal tube about 6 inches long with an eyepiece at one end, a cross hair at the other end, and a  level vial on top (fig. 15-37). Part of the cross-hair end is covered with a mirror that reflects the image of the bubble to the viewer. To use the hand level, look through the eyepiece end at the rod with the level vial on top. Tilt the entire hand level until the bubble is centered on the cross hair while looking through the eyepiece. It is sometimes necessary to know the height of the level above the ground   where   you   are   standing.   This   may   be accomplished by resting the level on a stick of known Figure 15-7.—Hand level. 15-21







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