*Illustrated with drawings and with photographs

Some sounds are so powerful that they smash buildings -- and others are so delicate that they drill teeth painlessly. Whenever we speak, whenever we listen, we use sound.

What is this remarkable thing called sound? How does it travel? What can it do for us? In this book Dr. Freeman, an eminent physicist, tells us what scientists have discovered about sound. And he explains the research being undertaken on the frontiers of science.

Some scientists are studying the production of sound by musical instruments, by electronic devices, by animals and by human beings. Other scientists are finding better ways to control noise. Still others are developing ultrasonics as a sensitive tool for use in laboratories and factories, for underwater sonar -- and even as a more efficient method of washing clothes and dishes.

All About Sound and Ultrasonics is a stimulating introduction to an important branch of modern science.

From the dust jacket