The Shepherd Gate Clock (51°28′41″N 0°00′05″W / 51.4779315°N 0.0014052°W) is mounted on the wall outside the gate of the Royal Observatory, Greenwich building in Greenwich, Greater London. The clock, an early example of an , was a sympathetic clock mechanism controlled by electric pulses transmitted by a motor clock inside the main building. The network of 'sympathetic clocks' was constructed and installed by Charles Shepherd in 1852. The clock by the gate was probably the first to display Greenwich Mean Time to the public, and is unusual in using the 24-hour analog dial. Also it originally showed astronomical time which started at 12 noon not midnight.
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| - Die Shepherd Gate Clock (51° 28′ 40,6″ N, 0° 0′ 5,1″ W) ist eine Uhr, die im rechten Torpfeiler des Eingangsportals des Royal Greenwich Observatory eingebaut ist. Zur Außenseite hin ist das Zifferblatt angebracht, während auf der Innenseite hinter einer Glasfront der Mechanismus zum Antrieb der Zeiger zu sehen ist. (de)
- The Shepherd Gate Clock (51°28′41″N 0°00′05″W / 51.4779315°N 0.0014052°W) is mounted on the wall outside the gate of the Royal Observatory, Greenwich building in Greenwich, Greater London. The clock, an early example of an , was a sympathetic clock mechanism controlled by electric pulses transmitted by a motor clock inside the main building. The network of 'sympathetic clocks' was constructed and installed by Charles Shepherd in 1852. The clock by the gate was probably the first to display Greenwich Mean Time to the public, and is unusual in using the 24-hour analog dial. Also it originally showed astronomical time which started at 12 noon not midnight. (en)
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| - Die Shepherd Gate Clock (51° 28′ 40,6″ N, 0° 0′ 5,1″ W) ist eine Uhr, die im rechten Torpfeiler des Eingangsportals des Royal Greenwich Observatory eingebaut ist. Zur Außenseite hin ist das Zifferblatt angebracht, während auf der Innenseite hinter einer Glasfront der Mechanismus zum Antrieb der Zeiger zu sehen ist. Diese Uhr ist ein frühes Beispiel einer öffentlichen, elektrischen Uhr. Es handelt sich bei der Uhr um eine sogenannte Nebenuhr, die von einer Hauptuhr gesteuert wird. Nebenuhren dienen nur der reinen Zeitanzeige und haben selbst keine zeitbestimmenden Bauelemente wie Pendel oder eine Unruh. Die Shepherd Gate Clock mit der dazugehörigen elektrischen Uhrenanlage wurde 1852 von Charles Shepherd jun., einem englischen Chronometermacher, konstruiert und installiert. Die Uhrenanlage bestand aus einer Hauptuhr (master clock), drei Nebenuhren (slave clock) im Innern der Gebäude und der sogenannten Gate Clock am Portal. Die Gate Clock war die erste Uhr, die Greenwich Mean Time auch für die Öffentlichkeit zugänglich machte. Ungewöhnlich für eine öffentliche Uhr ist das 24-Stunden-Ziffernblatt, welches aber bei Präzisionspendeluhren in Observatorien üblich war. (de)
- The Shepherd Gate Clock (51°28′41″N 0°00′05″W / 51.4779315°N 0.0014052°W) is mounted on the wall outside the gate of the Royal Observatory, Greenwich building in Greenwich, Greater London. The clock, an early example of an , was a sympathetic clock mechanism controlled by electric pulses transmitted by a motor clock inside the main building. The network of 'sympathetic clocks' was constructed and installed by Charles Shepherd in 1852. The clock by the gate was probably the first to display Greenwich Mean Time to the public, and is unusual in using the 24-hour analog dial. Also it originally showed astronomical time which started at 12 noon not midnight. The gate clock distributed the time publicly; another time signal of the observatory was the time ball, since 1833. The time ball only signalled 1.00pm (13:00), but could be seen from afar. Eventually the idea of distributing time signals via wires led to more and more electrical distribution of time signals by this method. Time signals, besides from their general importance in the affairs of business, were especially important for running ships and trains punctually. The situation was exacerbated by a lack of accuracy in many clocks compared to modern time-keepers. (en)
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