In 1833 Carl Friedrich Gauss and Wilhelm Weber succeeded in sending messages via an electromagnetic data line. 174 years later – since 19th November 2007 – the Measurement Valley Laser-Telegraph sends encoded messages from the observatory to the St. John’s church.
You are welcome to try to solve the puzzle. All you need is curiosity, open eyes, the code and a good view.
To take notes of the message it suffices to see a small part of the laser beam.
Every night in the sky above Goettingen
Every night, the laser starts on the first full hour after sunset and lasts for two hours. E.g. at the Winter solstice the sun sets at 4:13 pm, the laser starts at 6 pm.
|Month||Start CET||Start DST|
|March||8 p.m||9 p.m|
|October||8 p.m||7 p.m|
How it works
The transmission of the message begins with a starting sequence, which consists of long and short pulses.
After the starting sequence the real signal transmission begins. The messages are converted with a code developed by Gauss and Weber. Every letter is converted into a combination of long and short laser pulses.
The chart below helps to decode the message.
+ stands for short pulses
- stands for long pulses
Letters and words are separated by pauses of different lengths. A stop signal ends the message. It consists like the start signal of a series of alternating long and short pulses. The message will be repeated over the two hours in which the laser telegraph is working.