Right angle prisms
A prism is a translucent glass body which boundary surfaces is polished and
reflected. A prism serves for the detour of rays of light. In the surveying one needs prisms, in order to mark right angles out or examine right angles to up-bend one point for a straight line and around itself into a straight line in aligning. The most common angle prisms are the doublepentagon and the cross visor. The angle prisms have a hole or a groove at the lower end of the handle, in which a plumb bob cord can be inserted.
Jennifer Buck, Jan Sturmat
VT 01 10.06.2002
BackVT 01 10.06.2002