Sundial cannon, late 19th or early 20th century.At a certain set time the magnifying glass would foc

Sundial cannon, late 19th or early 20th century.At a certain set time the magnifying glass would foc
Sundial cannon, late 19th or early 20th century.At a certain set time the magnifying glass would foc
Sundial cannon, late 19th or early 20th century.At a certain set time the magnifying glass would foc

Sundial cannon, late 19th or early 20th century.At a certain set time the magnifying glass would focus a beam of light on the touch hole which sets off the gunpowder charge firing the cannon.from Cowans Auction -- source link


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