How to Graph Tide Data, Continued
Divide the first line into four equal segments as shown in figure 7-6. The easiest way to do this
is to extract the length of the line with dividers and place this length on the height scale. In the
case of the first line, this distance is 2.0 feet (approximately). Divide this by 4 and you have the
length of each segment 2.0/4 = 0.5 feet. Measure 0.5 feet along the height scale with your
dividers, then, starting at either end, divide the line into four segments.
At the quarter point next to the high water point, draw a vertical line above the point; and at the
quarter point next to low water point, draw a vertical line below the point equal to a distance of
1/10th of the total length of this line segment (i.e., 2.0 x .l = 0.2 feet). Refer to the example
Repeat steps 4 and 5 for the remaining two lines as shown in figure 7-7. Be sure to use the
length of the line you are working with for your computations; using the same measurement for
the first line will not work.
Figure 7-7. Repeat steps for the remaining two lines.