Tower clock from the demolished Waterpoort in Gorinchem, anonymous, c. 1585 - c. 1615 Canvas Print
Movement with loose hammer, belonging to a bronze bell, coming from the tower of the demolished Waterpoort in Gorinchem. The clock is dated: 1581. The calculation on the ground wheel of the going work served to put the movement on time. These numbers had to be in accordance with the position of the pointer. Relative to a marking, or possibly the intervention of the small gear at the top could one is put in the right position within the pointer. The hour hand could not be read so accurately, but for the percussion it had to be accurate. By sliding the anchor out of the gear wheel, the gears can turn freely and the pointer can be put on time. The small gear on the outside of the going work has 12 teeth and goes around once every 2 hours, this can be seen from the calculation on the ground wheel of the going work, which gives twice 60 minutes. On the ground wheel there are 2 lugs that get the percussion going. So he hits twice every 2 hours. Also on the closing disc it can be seen that there is no half-hour stroke. Under the gear is the bearing support for the vertical axis to the hands higher in the tower. The gear that is driven by this must contain 72 teeth (ratio 1 : 6), so that this shaft rotates once every 12 hours, equal to the small and only pointer. Minute hands are only from considerably later time. If the gear has fewer teeth, there is still a transmission somewhere with uneven gears to ensure that the pointer goes around once every 12 hours.
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