DENT CONGREVE ROLLING BALL CLOCK

#Rollerball clock #Dent
The Dent Congreve Rolling Ball Clock is a famous skeleton style mechanical clock by Dent, London. Here are some of the highlights of this model:
How it works
The time is controlled by a ball rolling on a tilted tray. After about 15 seconds, the ball reaches the end point, the tilted tray reverses, simultaneously pushing the second hand to jump, the minute hand and the hour hand to move in the correct direction
Wikipedia
Renaissance Antiques
This design is actually an "oscillator" instead of a "resonator", so it is often not very stable — depending on the friction and cleanliness of the tray, ball
Wikipedia
my-time-machines.net
Appearance & aesthetics
Brass body, architectural open frame, three dials (hours – minutes – seconds jump 15s) on the face.

Protected by acrylic or plexiglass dome, veneer or marble base, with adjustable leveling feet

Typical dimensions: height approximately 35–50cm, width ~30–45cm, depth ~25–35cm