Cargo tramways can be fully or partly powered by gravity, and some deliver excess power that can be utilized to generate electricity or to drive cranes or machinery in nearby factories
During the last quarter of the 19th century, a radically improved generation of tools appeared.
Boat mills, bridge mills and hanging mills were almost as widespread as windmills.
The human power required to achieve a speed of 30 km/h in a velomobile is only 79 watts, compared to 271 watts on a normal bicycle.
Flushing the water closet wreaks ecological havoc, deprives agricultural soils of essential nutrients and makes food production dependent on fossil fuels.
Estimates about the fuel efficiency of aircraft ignore the record of the pre-jet era.
Not so long ago, each profession or trade had adopted the knots best suited to its requirements, and knotting was part of their daily lives.
Ropewalk factories are some of the most remarkable industrial workshops and buildings in history.
We don’t need better batteries, we need better cars.
One hundred years ago electric cars were a common sight on city streets in Europe and the United States.
The only advantage that fossil-fuelled powered cranes have brought us, is a higher lifting speed
During the Second World War, almost every motorised vehicle in continental Europe was converted to use firewood.