Code And Communication

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Rees's_Cyclopaedia_Chappe_telegraph Chappe’s Model 

Chappe’s Telegraph was the method in which my group sent visual code to another. We were sent around 30-50m away from one another to the top of a building balcony with a set sentence to send our peers. This however was our major downfall and learning curve as we believed we were thinking of our own message to send and only had written down 10 letters to use for “hello”. This particular concise technique was impractical however for when we needed to send the set message from Mat.

We used our bodies to physically create the shapes from Chappe’s model and were interpreted by the other group effectively.Some noise factors included the complexity of the shapes unable to be replicated by our bodies, and some that looked very similar to others. Also a “next letter” check would have been useful for the second ‘L’ in Hello. I’ve taken away the disadvantages of abbreviation or concise techniques when coding a message, and that it is imperative to have a whole key for a system.

When it was our turn to decode the opposite groups message, they devised their own system of clapping to represent letters, starting from 26 claps to represent A and working their way down. To get past 10 claps, one fist was raised, and 20, two.

The Message we decoded from their signals was “SOS we ‘r’ inking”… which was later thought about and concluded correctly to “SOS we are sinking”. Some type of error checking in this would have greatly improved the result as we needed them to repeat certain letters and they perceived it as we were ready to proceed. Also a physical “SPACE” key would have de cluttered the words into separate words instead of us guessing when a word had finished.

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