structure according to prepared plans and to mark the

stakes E and F by measurement and determine their

controlling points of the structure in the manner that

elevation.

is most useful to the construction force. This

marking consists of indicating the corners of the

point A, turn a 90 angle, and locate and place corner

building and other horizontal and vertical positions

stakes G and H by measurement and determine their

by means of stakes, batter, boards with string-lines,

elevation.

and cut-and-fill notations.

the layout during excavation and construction.

measuring the length of the diagonals, EH and FG

The procedures for a typical simple budding

and comparing it with the length computed by

layout are shown in figure 1-36.

where *c *is the computed diagonal

length and **a **and **b **are the lengths of the two sides

monument or bench mark, or a fixed line such as a

(see calculation of diagonal, fig. 1-6).

The

street curb, and then locate point C and D on the

squareness can also be checked by using a 3 - 4 - 5

baseline by measurement.

right triangle or carpenter's square to check the 900

angle at the corners. The procedure of laying out a

simple rectangle with a measuring tape is the same as

point B, turn a 90 angle, and locate and place corner

with an engineer's