Sources
- HowStuffWorks. YouTube. (2007 March 9). How Clocks Work [video file]. Retrieved from https://www.youtube.com/watch?v=7RgvXGPfTg8.
- Leedsmuseums.YouTube. (2012 August 22). The Clock That Changed the World (BBC History of the World) [video file]. Retrieved from https://www.youtube.com/watch?v=T-g27KS0yiY&t=1514s.
- Royal Museums Greenwich. Collections. Retrieved from
http://collections.rmg.co.uk/collections/objects/79141.html. Accessed
2018 November 21.
- Sobel, D. (1995). Longitude: The true story of a lone genius who solved the greatest scientific problem of his time. New York: Walker
- Woodford, Chris. (2010/2016) Pendulum clocks. Retrieved from https://www.explainthatstuff.com/how-pendulum-clocks-work.html. Accessed 2018 November 21.
Images:
- http://www.nationaltrustcollections.org.uk/object/959830
- http://navis.gr/navigation-columbus-learning/
- https://pngtree.com/freebackground/continental-corner-pattern-background_427409.html
- https://www.scienceabc.com/innovation/pendulum-clock-works-escapement-ticking-sound-falling-weight.html
- https://upload.wikimedia.org/wikipedia/commons/7/7b/Grasshopper-escapement_colored.gif
- https://upload.wikimedia.org/wikipedia/commons/d/d5/HMS_Association_%281697%29.jpg
- https://upload.wikimedia.org/wikipedia/en/e/e3/John_Harrison_memorial_02.jpg
- https://www.vacationstogo.com/cruise_port/Barrow-in-Furness__England.cfm
- https://en.wikipedia.org/wiki/John_Harrison
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