Page 228 - SCIENCE DLP T6 SK (SEMAKAN 2017)

Simple Telegraph Machine

Make a simple telegraph machine using a Morse code chart, two AA-sized
dry cells, dry cell holder, buzzer, connecting wires, switch, A4-sized cardboard,
and hot glue gun.

Steps:
1. 2.

Sketch the position of each Paste the components such as the
component for the telegraph dry cell holder, buzzer, and switch
machine on a cardboard. on the sketches using a hot glue
gun.

3. 4.

Use connecting wires to Put dry cells into the dry cell
connect each component in holder.
the telegraph machine.

5. Turn on and switch off the switch to
8.2.6 produce sound from the buzzer. Long
8.2.7 buzzing sounds refer to the lines in
the Morse code chart. Whereas, short
buzzing sounds refer to the dots (.)
in the Morse code chart.

simple telegraph
machine
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