machinery

Photographs and explanatory text describe how various things work, including airplanes, televisions, escalators, and bridges.

When the old wooden bridge breaks, a young boy is delighted to be able to watch, from his front yard, the many different machines at work building the new bridge across the brook.

Examines various simple machines and how they are used to make work easier and provides activities using wheels, levers, pulleys, screws, and more.

Depicts such vehicles as the bulldozer, combine harvester, street cleaner, fire engine, backhoe, and concrete mixer.

Introduces basic facts about the construction and function of simple machines with instructions for related experiments and projects.

Contains step-by-step instructions for twenty-five simple experiments that illustrate the science concepts behind tools and machines, and traces the evolution of tools from simple stone implements to twenty-first-century technology.

An introduction to machines, from levers and pulleys to compound machinery, which includes instructions for activities and projects to illustrate the principles.

Henry finally finds a purpose for the "Incredible, Amazing Machine" that he built.

While snowbound in their rural home, a son shares with his mother all the helpful things he would do-- just for her.