The still is used to distill alcohol.

The acid is used to neutralise the base.

Silkworms are used to produce silk.

Wires are used to convey electricity.

The spindle was used to spin the yarn.

A hideous monster used to live there.

The cementitious material is used to strengthen the structure.

The jackscrew is used to lift heavy objects.

The pyrometer is used to measure high temperatures.

The gyroscope is used to measure and maintain orientation.