Prism pole for a surveying system

摘要

The prism pole consists of an extensible aluminum pole that can be adjusted between a length of 30 and 47 inches. The pole has a hardened steel point on one end thereof and a prism assembly on its opposite end. The prism pole also has a steel point mounted to the prism assembly such that the pole can be turned "upside down" placing the prism assembly approximately 4 inches from the point being measured. To assist in plumbing the prism pole, two level vials are provided, the first being observable when the pole is in the upright position and the second being observable when the pole is in the upside down position.