Duties of the Rodman

LEVEL PARTY ORGANIZATION, EQUIPMENT, AND FIELD Procedures

FIELD PROCEDURES FOR Differential Leveling

Engineering Aid 3 - Beginning Structural engineering guide book
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Figure 14-4.-Recommended carrying position of instrument when obstacles may be encountered. the level and clamp screws slightly. They should be tight enough to prevent the telescope from swinging and the instrument from sliding on the footplate, but loose enough to allow a “give” in case of an accidental bump against an obstacle. When you are carrying the instrument over terrain that is free of possible contacts (for example, across an open field), you may carry it over your shoulder like a rifle. But when obstacles may be encountered, carry the instrument under your arm, as shown in figure 14-4. To avoid the effects of sunlight, you should use a surveyor’s umbrella or the like. If there is any great difference between the working and storage temperature, the instrument should be allowed to adjust itself to the actual working conditions for about 15 min before observations are started. Duties of the Rodman The rodman must hold the leveling rod properly in order to sight on it or read it accurately. This is the rodman’s responsibility. The actions of a rodman in positioning and holding the rod will affect the speed and accuracy of the leveling operation, so if you are the rodman, use extreme care. It is also the rodman’s responsibility to take care of the rod during and after the leveling operation. Your duties as a rodman are as follows: 1. Clean the base (or shoe) of the rod before setting the rod on any of the point to ensure rod and the point. point. Also, clean the top good contact between the Figure 14-5.-Proper stance for holding a level rod on a bench mark while facing the instrument. 2. Place the rod firmly on the point; then stand facing the instrument and slightly behind the rod; hold the rod in front of you with both hands (fig. 14-5). Space your feet about 1 ft apart for a comfortable stance. Also, make sure that the graduations of the rod are right side up and are turned towards the instrumentman. 3. Hold the rod as nearly vertical as possible, then place a rod level against the rod, and move the top end of the rod until the bubbles are centered. If you do not use a rod level, balance the rod by using your fingertips to prevent it from falling. A properly balanced rod will stand for several seconds before starting to fall. This process of balancing the rod vertically is known as PLUMBING THE ROD. 4. Plumb the rod and hold it as steady as possible during strong winds. When this condition exists, the instrumentman may call for you, as the rodman, to WAVE THE ROD. Wave the rod by pivoting it on its base and swinging it in a slow arc toward the instrument and away. Keep the shoe firmly seated during this operation. The 14-6

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