The Solar Cannon,An interesting contraption that was popular in the 18th century, the solar cannon w

The Solar Cannon,An interesting contraption that was popular in the 18th century, the solar cannon was used to signal 12 o'clock noon.  When loaded and set up properly, a magnifying glass would concentrate a beam of sunlight onto a fuse or charge of gunpowder located at the touch hole, discharging the cannon, and signalling that it was 12 o'clock noon. -- source link
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