In his spare time he worked at various mechanical inventions.

Chinatown, true enough, had adopted the mechanical inventions of America.

Nuremberg was an early center of humanism, science, printing, and mechanical invention.

His first mechanical invention was made at ten.

He shared a gift for mechanical invention with his brother Thomas.

People were ready to purchase mechanical inventions of this type.

There were many other mechanical inventions during the Tang era.

The reason for this is that mechanical invention has been applied extensively to different tasks of the home.

Being much interested in mechanical inventions, he also spent some time on a horizontal windmill to be used for raising water.

One source claims it is the only basic mechanical invention of the 20th century.