This recording for math teachers was made on location, at a set of locks in Chester, England.
Locks are an example of amazingly ingenious technology, invented hundreds of years ago and still working today. Without any electricity, fossil fuels or other 'external' sources of energy, locks merely use the power of gravity as it acts on water in an enclosed lock. The water flows into a closed section of the canal, causing the barge in that section to rise, and so raises a boat from a lower section of the canal to a higher one, in a few minutes.
No comments:
Post a Comment