Today’s safety elevators don’t fall when cable breaks. A lock invented by American industrialist Elisha Otis locks the elevator while descending at high speed and hence prevents falling. This death defying elevator was introduced in 1852. Watch this discovery channel video to see how it was invented.
You may also like:
Are MRIs safe?
Digital circuit and logic gate
Why do we put salt on icy road instead of heating?
Sleeping in space
Exclusive OR gate (XOR gate)
Folding paper more than seven times
How much sugar is added to a can?
Make a basic electric motor
Laptop computer or mobile phone explosion
Bicycle, most energy efficient method of transportation