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38 The AudioVisual Handbook
At the right side of the map, twenty bolts are placed in two rows
of ten each. There should be as many bolts along this side as there
w are in the map. These two rows
should be four or five inches
*r "'"* .^ apart and the bolts from one to
two inches from each other in the
rows.
A piece of the insulated wire
is used to connect one bolt in
\ v< one of the two rows at the left
of the map to one of the bolts at
the right of the map, as shown in
_, . _ ,. __ the illustration of the reverse
Back of the Map . , , „ ,
side ot the map. Kemove enough
of the insulation from both ends of the wire to wrap around each bolt.
The radio battery is wired to the base of the map on the back by
running wires at right angles around the battery and through the
plasterboard. Make a circle about one-half inch in diameter in the
extreme lower left-hand corner of the board and insert the socket for
the lamp.
Connect one of the terminals of the battery with one of the terminals of the lamp socket. On the other terminal of the battery, connect one end of a piece of wire which is long enough to reach all the bolts in the rows at the right side of the front of the map. To the other terminal of the lamp socket, connect a wire long enough to reach all the bolts in the lower right-hand corners of the specimen squares on the front of the map.
When the ends of both of the free wires are in contact with the two bolts which have been connected, for example, one on the picture of the butterfly and the other on the name of the butterfly, there will be a light.
Get a piece of two or three-ply cardboard, the size of the plasterboard used for the construction of the outfit. Cut out small square holes in the cardboard, to fit over the nuts on the front of the map, as shown in the illustration of the front of the map. Then paste the pictures or the specimens in the square spaces to the left and above the nuts.
The correct names of the butterflies or other specimens used should be pasted immediately to the left of the nuts in the two rows at the right. This should be done accurately, and the person constructing the map should test the identifying names to make certain that they