Portuguese table cannon sun dial, mid 19th century
These dials has been very popular since the 18th century, combined with a cannon and a burning glass, is set so that when the sun reaches its highest point at noon, a charge of gunpowder is ignited by the bundled rays of the sun, so that a loud bang sounds.
Huge examples were palced in Dockyards and Arsenals to signal noon and lunchtime.
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Portuguese table cannon sun dial, mid 19th century ...These dials has been very popular...
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