Using a Pelorus

1
Using a Pelorus
to Measure Distance
2
A chain is a measurement of length equivalent to
22 yards (20.12 meters), which is one tenth of a
furlong or one eightieth of a mile. It was used
in surveying land in England and places under
English influence, such as the United States, but
is obsolete in many places. It is also called
the surveyor's chain or Gunter's chain after 17th
century mathematician and astronomer Edmund
Gunter, who introduced it. The distance of 22
yards is the length of the pitch (from wicket to
wicket) in the sport of cricket.
3
This is your target for Activity 1.
4
Turn your sextant on its side with its top mirror
to your right. Move the lower limb back and forth
to find the image of the ball.
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6
90 degrees
7
65 degrees
8
Line up the ball in the middle of the mirror and
with the edge of the sidewalk.
9
read your pelorus
41.5 degrees
10
Determine where you are standing.
11
Use your new skills to complete activities 2 3.