Geography Reference
In-Depth Information
Exercise Steps and Questions
You need to have a piece of paper (called a worksheet) for drawing your measure-
ments and making the basic calculations, which you should place on a pad or spiral
notebook. You will also need a straightedge ruler and a few colored pencils. Your
instructor will provide you with a protractor that you will use to measure angles.
Your instructor will have created several baselines in the lab room. Each line is
measured in centimeters. Each baseline forms a side of the triangles you will con-
struct to locate objects in the room.
First, form a group of four or five people. Prepare your lab instruments and get one
protractor for each group.
Each person should complete a sheet indicating all mea-
sures, constructions, and calculated distances
.
You will be surveying and determining the angles from the baselines to
five
objects
in the room. Example objects are:
Thermostat
•
Window levers
•
Wall sprinklers
•
Emergency lights
•
Clock
•
Light switches
•
To start with your survey, go to one of the baselines. Two points are indicated, one
labeled
A
and the other
C
. Draw a line to scale on your worksheet positioned to fit
the surveyed elements and label the points. If your baseline is in the front of the
room, put it at the bottom of the page. No matter where you are in the room, remem-
ber to always keep the orientation of
your page. To figure the scale, set
up a conversion ratio—for example,
1 inch on paper = 100 cm in the room.
Put point
A
on your worksheet directly
over the corresponding point
A
on a
baseline in the room.
Accuracy here
is very important
. Make sure to keep
the paper stable after you have found
the right position. Now, take your
straightedge and point it from the
point on your worksheet to the object
you will survey—clock, thermostat, or the like. Make sure you are very accurate in
drawing the line with one of your lighter-colored color pencils. Draw a straight line at
least long enough to cover the distance in scale (you will get better at this with expe-
rience). Move to the second point (point
C
), reposition your paper so that point
C
on
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