❸
DRAWER GUARD
You can fix up your special
drawer using some aluminium
foil as shown. If the drawer is
opened the aluminium foil will
brush past the two metal ends
of the Jack Plug wires so com-
pleting the circuit and setting the
alarm off.
Hide the Logiblocs at the back or beside the drawer where there is usually a
bit of space.
❹
CHECK FOR METAL!
We can use the two metal ends of the Jack
Plug Wires to test for metal. Metal con-
ducts electricity and so you can test all
sorts of objects. Use the same Logibloc
arrangement shown on opposite page. Test
a pencil. Does the lead inside conduct
electricity? So it’s not just metal that
conducts electricity. Your message should
be “Look! I conduct electricity!”
Remember not to put these wires anywhere near any mains electrical outlets
because that could be very dangerous.
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