Each student team ( two or three students) is given
a pointer box, so that the wooden pointer stick can have its direction and
elevation set.
A map of the room must
be made so as to determine where the pointer boxes are to be placed, to
simulate station locations in the
The elevation angle is the
angle which the source is above the horizon. It is set on the side of the box
by raising the pointer stick. It is measured by the protractor placed on the
side of the box.
The direction is clockwise from North. 90 degrees is
East, 180 degrees is South. The Station Marker Sheet indicates the name of the
station and which way North is.
The tables need to be flat.
Specific locations for the pointer boxes must be clearly labeled with the Station Markers taped to the tables. When all the Station Markers
are attached to the tables, their arrows must all be pointed North.
Before the lab is to be run,
the teacher must record all the elevations and directions for all the stations;
a. select an object at the back of
the room as the source.
b. place a pointer box
on each station marker with the rear corner of the box on the protractor’s
center.
c. aim the fold-down cardboard
pointer in the direction of the source (on the horizon)
d. lift the pointer arrow ( wooden stick ) so that
it is pointing directly at the source
e. read and record the
elevation from the protractor on the side of the box on the Teacher
Data Sheet
f. read and record the
direction from the station marker protractor taped to the table using the edge
of the box on the Teacher Data Sheet
g. go around and record all of
the elevation angles and the directions for each pointer box.
h. choose another source in the
room and repeat a-h ( optional )
Each student lab group is
given;
a. a location at which they
must place their box
b. an elevation angle
c. and a direction
d. a pointer box
e.
and is asked to record the data on their Student Data Sheet
b. finds their
station
c. places their
box on the station
d. sets the elevation
angle for the wooden pointer stick on the side of the box and fastens the
pointer in place with a pin
e. rotates the box so
that the folding cardboard pointer is pointed in the correct direction (
degrees from North) with the end of the wooden pointer stick ( corner of the
box) on the center of the protractor on the Station Marker sheet.
Once every pointer box is in position,
the class will be able to:
a.
see where they are all pointing
b. and identify the source.