LINE SQUARE

A line square for laying out a building; for a permanent lay out reference for large constructions of the type which require a considerable period of time such as bridges and piling work; for a factory machinery layout; for a grocery store, shelves and aisles layout; and for measuring inaccessible objects such as Stone Mountain illustrations and the like. A reference line is drawn taut across the area to be aligned, and an instrument support member is hand held on the line in alignment therewith. A theodolite, transit, or a simple angularly adjustable telescope is supported on the instrument support for movement along the line to align the instrument at any desired transverse angle to the line. The line may run horizontally, angularly, or vertically, as desired.