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The Shepherd Gate Clock is mounted in the wall outside the Greenwich Observatory. It was the first clock to show Greenwich Mean Time to the public. It is a slave clock that keeps time by recieving electric (galvano-magnetic, as it was then called) pulses from a master clock in the Observatory. It has a twenty-four hour analogue dial with Roman Numerals and the addition of a zero (Romans did not use Zero)to mark midnight. With the coming of the railway, Sir George Airy wanted to standardise the many local times that were in use in the country at the time. In 1849, Charles Shepherd of 53 Leadenhall Street, London, had patented a system for controlling a network of Master and slave clocks using electricity. He had installed the Master, Slave Clocks and Time Ball at Greenwich by August 1852. The Slaves here worked with pulses received every second. Pulses were also sent to another Master at London Bridge which then passed them on at a lesser frequency to clocks all around the country. By 1866, time signals were being sent to Harvard University, USA, via transatlantic cable.

Tags

greenwich, meridian, galvano, gate, clock, time, mean, shepherd, slave

Comments

  • LjMaxx
    LjMaxxalmost 6 years ago

    Fabulous clock image and interesting stat information to go with it… Brick work/treatment here equally nice.. :)

  • Thanks Lj! Its a piece of history stuck in a wall.
                                            *_:)_* Tony.

    – A90Six

  • midzing
    midzingalmost 6 years ago

    fantastic image and information,,,, well done

  • Thanks Wendy! Good to see you!
                                            *_:)_* Tony.

    – A90Six

  • mrscarlotta
    mrscarlottaalmost 6 years ago

    Brilliant, very old, never seen anything like this before hon xxxxxxxxxxxxx

  • Thanks Carlotta! Thought you were talking about me for a minute!
                                            *_:)_* Tony.

    – A90Six

  • Agnes McGuinness
    Agnes McGuinnessalmost 6 years ago

    This s beautiful, Tony, and your treatment really suits the subject so well. A lovely bit of history. Agnes:))

  • Thanks Agnes! The clock was great, but the brickwork was a little dull so I played with it a little.
                                            *_:)_* Tony.

    – A90Six

  • Lois  Bryan
    Lois Bryanalmost 6 years ago

    WOW!!!! hooooow interesting!!! I had NO IDEA any of that took place!!!! Soooo cool!!!! And … let us not overlook your fabulous photo!!!!! Wonderfully detailed!!!!! Great, great job!!!!!

  • Hi Lois! I thought that was a Woo Hoo and instead got blown away with a Wow How! Thank you so much!
                                            *_:)_* Tony.

    – A90Six

  • Alf Caruana
    Alf Caruanaalmost 6 years ago

    that is so interesting, thanks for posting that info. The image has excellent detail. well done

  • Thanks Alf! It’s funny when you think GMT has only been around for about 150 years. Before that, a watch would have been pretty useless to anyone travelling with so many time changes every few miles East or West.
                                            *_:)_* Tony.

    – A90Six

  • izzybeth
    izzybethalmost 6 years ago

    the colors… THE COLORS!!!

  • Thanks Izzy! I brought the colour out in the bricks as they were a bit dull in the orig. I thought 13:05:17 showed the hands off pretty well!
                                            *_:)_* Tony.

    – A90Six

  • izzybeth
    izzybethalmost 6 years ago

    Oh, and look at the little heart pointer thingy. I love this.

  • Mayina
    Mayinaalmost 6 years ago

    Great image Tony!!

  • Thanks Gwenda!
                                            *_:)_* Tony.

    – A90Six

  • Béla Török
    Béla Törökalmost 6 years ago

    Wow…excellent capture Tony!

  • Thanks Béla!
                                            *_:)_* Tony.

    – A90Six

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