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Get a pencil. Find a chair or a piece of furniture. The goal: to practice getting a feel for sighting. That is, you'll actually perform a visual measurement - visually "sighting" horizontal and vertical lines in the world (on a chair in in this example) and then comparing, gauging, and relating them to the edges of your paper or a drawn format on the paper. In Part VI , animation one demonstrates this whole lesson.
Materials: a fairly new, (long) pencil, a paper, one chair (or go to the chair illustration - it's in step 3 below.) Read through the exercise first.
Time required: about 10 minutes for a "dry run" - if you do this without doing the drawing part. Give yourself 30 minutes otherwise.
Step 1: Vertical Angles
Take hold of your pencil. Hold it straight up and down - that is, vertically - with the eraser up. (Just like in the illustration.)
Now, with pencil vertical in hand, extend that arm in front of you. (Elbow straight.) Close one eye. (If you're holding out your right arm, close your left eye; if you're holding out your left arm, close your right eye.
Aim down your extended arm without tilting your head to either side. Pick an edge or corner of the object: any edge or corner. Compare it to your vertical pencil. It will form an angle or it will be parallel to the pencil. Close your eyes and imagine that angle. Imagine how you'd draw it on the paper. Open your eyes.
between your vertically
held pencil, the
Now draw a line on the paper that matches the angle between the vertical pencil and the edge of the object. Use the edge of the paper as the counterpart to the vertical reference of the pencil. If the edge you've chosen is vertical, then draw a line that's vertical, i.e. parallel to one of the sides of the paper.
Drawing the angle you've "sighted" in step 3 on your paper.
Step 5: Horizontal Angles
Hold your pencil horizontally. You want it parallel to the floor. (Sometimes if you hold an end of the pencil in each hand - eraser end in one hand, pointy end in the other - it's easier to hold a steady "horizontal". Remember to hold your arms straight out in front of you with elbows fully extended.)
the angle of the dotted lines on the table to the dotted
Choose another edge on your object. Compare it to the horizontal of the pencil. Depending on the angle you're viewing the object from, the edge you've chosen might be parallel to your pencil or it might diverge at an angle. Observe that relation: parallel or angled. Close your eyes and picture how that angle can be drawn on the paper. Open your eyes.
the angle between your object or the beach chair and
horizontal (the horizon line of the wall or the
Now, with that angle, that relation in mind, draw it on the paper. This time use the top and bottom of the paper to serve as the horizontal gauges.
(Note: it's good to get in the practice of keeping your arm fully extended.Why? Because with your arm straight out, your hand is always the same distance away from your eye and so it appears on your retina as the same size. It becomes a standard of comparison that won't change.)
There, you've done it!
You've done your first official sighting. You now know what sighting is: you've experienced it. Not to worry, you'll get lots more practice using it. In fact, go right to the...
....Easy Homework. While it's fresh in your memory, read over these next 2 drills:
Go to Exercise 2 in Sighting
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