essentially a portable drawing table used in conjunction with a mounted sighting device and straight edge, which allows accurate setting out drawings to be made on sight.

A level, flat surface mounted on a tripod upon which paper can be securely fixed for plotting of the survey in the field by using methods of radiation, intersection and traverse.

surveying instrument consisting of a drawing board and a ruler that are mounted on a tripod; used to sight and map topographical details

See under Plane, a.