perpendicular, but you also bisected, or divided, line AB

into two equal parts.

2. Use a pair of dividers to CONSTRUCT A

RIGHT ANGLE AT A GIVEN POINT. You will find

this skill quite useful in making layouts. Figure 12-16

illustrates one method for constructing a right angle at

a given point.

Suppose you have line XY with A as a point at

which you need to erect a perpendicular to form a right

angle. Select a point within the proposed angle that you

wish to construct. In figure 12-16 that point is C. Set the

dividers equal to CA, and using that distance for a

radius, swing an arc BAD with C as a center. Lay a

straightedge along the points B and C and draw a line

that will intersect the other end of the arc at D. Now,

stretchouts that are square or rectangular, such as a drip

draw a line connecting the points D and A and you have

pan or a box.

constructed a 90-degree angle.

TO LAY OUT A DRIP PAN WITH A PAIR OF

3. Figure 12-17 shows another way to construct a

DIVIDERS, you will need dividers, a scriber, a

perpendicular at a given point on a line:

straightedge, and a sheet of template paper. You know

Step 1: Take your dividers and place the point at

the length, width, and height or depth to which the pan

point B on line XY.

must be made. Now proceed as follows:

Step 2: Lay arcs on line XY at equal distances

Step 1. Draw a base line. (See fig. 12-18.) Select a

from B on line XY. These arcs become points S and T

point on this line for one corner of the drip pan layout.

on line XY.

Erect a perpendicular through this point to form a

Step 3: Before your next arcs are made, increase

90-degree angle (W in fig. 12-18).

the distance between your divider points. Set your

Now, measure off on the base line the required

divider point at S on line XY. Lay arcs directly above

length of the pan (L in fig. 12-18). At this point erect

and below P on line XY. These arcs become points W

another perpendicular. You now have three sides of the

and M. Repeat this procedure from T on line XY

without adjusting your dividers. You will have

stretchout. Draw the fourth side parallel to the base line,

intersecting arcs at W and M.

connecting the two perpendiculars that you have

erected. The fourth side will be drawn at a distance from

Now draw a perpendicular between the intersecting

the base line equal to the width of the drip pan.

arcs at W and M. You will have a right angle at B on

line XY.

Step 2. Now, set the dividers to mark off the depth

of the drip pan. You can use a steel scale to measure off

The three methods described in the preceding

paragraphs may be used to form 90-degree comers in

the correct radius on the dividers. Using each corner for

12-6

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