Noon Cannon
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"Noon Cannon"
--French, 19th century
At noon, heat from the sun ignites the fuse, setting off the cannon.
  
Portable Equatorial
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"Portable Equatorial Sundial"
--French, 19th century
To tell time accurately, sundials must be leveled, pointed north, and the angle of the post set for the proper latitude.
  
Portable Equatorial

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"Portable Sundial"
-- Paris, 18th century
Made by Jacque Lemair
  
Portable Equatorial

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"Portable Sundial"
--Kanghsi Dynasty, China
circa 1700