Bond of Union Quotes

“The earliest lock gates moved vertically, subjecting them to great pressure and friction. Leonardo’s innovation was paired mitered lock gates forming a V pointed in the direction of the higher water. Water was deflected to the sides when the gates were swung open, and pressure sealed the lock when the gates were closed. Over half a millennium later, canal locks are still built”
― Gerard Koeppel, Bond of Union: Building the Erie Canal and the American Empire