4 Written questions
3 Multiple choice questions
- If a cable broke and the cage began to fall, a spring caused two steel ________ to shoot out of the side of the cage.
- Otis's invention could be used to ________ people safely to the upper floors of very tall buildings.
- Elisha Otis invented a ________ that kept the cages from crashing to the ground.
3 True/False questions
landmark → His invention kept accidents from happening if a rope or wire ________ broke.
cathedrals → His invention kept accidents from happening if a rope or wire ________ broke.
method → The stone was not cheap and this ________ of building used a large amount of cut stone.