The following links show how locks work (with varying degrees of success!)
Have fun!
https://www.burgundy-canal.com/canal-lock/
https://pancanal.com/eng/general/howitworks/como-funcion.html (with sound effects)
The following links show how locks work (with varying degrees of success!)
Have fun!
https://www.burgundy-canal.com/canal-lock/
https://pancanal.com/eng/general/howitworks/como-funcion.html (with sound effects)