1. FAX — 2023-10-09 23:52:19

   …ny other surface composed of conducting and non-conducting materials can be taken by these means". {{TOC}} == Electric clocks 1841 == Bain had already invented the electric clock. Using this knowledge he felt he could improve [[Telegraph|tele…
   …graphy]] by transmitting copies of actual written documents. Bain used a clock to synchronize the movement of two pendulums, a transmitter and a receiver, for line-by-line scanning of a message. He …

2. Telegraph — 2023-09-23 15:56:52

   …rsmith, [[London]] . He laid eight miles of wire insulated in glass tubing in his garden and connected both ends to two clocks marked with the letters of the alphabet. {{Image url="RonaldsTelegraph.jpg" class="left" title="Ronalds Telegraph" wid…
   …mpulses were sent along the wire were used to transmit messages. To communicate messages Ronalds had made two identical clock-like machines, each with a moving index or hand, with the alphabet engraved around the dial. >>{{amazon type="book" it…

3. Atomic Clock — 2021-08-20 10:45:05

   … industry standard for time measurement at observatories throughout the world. {{Image url="AtomicClock.jpg" class="left" title="Jack Parry & Louis Essen with the first Atomic Clock 1955" width="700" }} ::c:: == Atomic Clo…
   …ck == Essen based his clock on caesium because ~& 'An atom will always have the same transition frequency anywhere in the universe'. His clock was…
   …n to operation, it was accurate to one second in 300 years. == Links == [[http://www.npl.co.uk/60-years-of-the-atomic-clock/timeline|NPL]]…

4. Greenwich Meridian — 2020-08-06 08:03:21

   …he [[British_Empire| Empire]] needed a method for navigators to find their position at sea. Flamsteed and others used clocks and celestial objects for navigators but it wasn't until **John Harrison** invented his marine chronometer that the lo…
   …ngitude at sea was fully mastered. Flamsteed had installed state-of-the-art pendulum clocks by the best clockmaker and set these clocks to the local time, Greenwich Mean Time. Flamsteed’s catalogue of stars become the standard …
   …and. {{Image url="PrimeMeridianRoofOpen.jpg" class="right" title="Prime Meridian Roof Open" width="" }} == GMT == All clocks around the world are determined by the longitude offset from Greenwich Mean Time. Because the earths crust is alway…

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