The Invention Hunters discover how machines work (Invention Hunters 1.)
by Briggs, Korwin (Author)
Series
Summary
"When the Invention Hunters, a group of globe-trotting invention collectors, visit a construction site in their flying museum, a boy helps them by explaining how simple machines like levers, pulleys, and cranks work"-- Full description
Series: Invention hunters
The invention hunters discover how machines work (Volume 1.)
The Invention Hunters discover how light works (Volume 3.)