lubrication and lubricants

Depicts inventor Elijah McCoy, the son of slaves, who studied to become a mechanical engineer in Scotland. After he returned to America, the only job with a railroad was shoveling coal into the engine's firebox. He went on to invent an oil cup that dramatically increased a train's ability to travel faster and safer.

Simple text and illustrations explore the life of African Canadian inventor Elijah McCoy.

Photographs and simple text describe how friction works such as how friction keeps different things from slipping or sliding.