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Working model after Anonymous Sienese Engineer, Ms. Additional 34113 (BLL), fol. 156r
The clock is wound up with a handle. The gears are arranged in a vertical sequence. The cord is fastened to the lower end of the spring. When the mechanism is loaded, the cord coils around the cone-shaped spindle, which has nine turns. The spring is thus compressed in an upward direction. It can only unwind by setting in motion the gear mechanism, regulated at the top by a bar balance with small adjustable weights. The clock functions efficiently for about six hours. The dial completes one revolution in a day and is divided into twenty-four hour sections.
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Clock with helical spring