Ask questions, solve problems, and build the solution! Enrich engineering skills when students are challenged to design and build hydraulic models. Students are guided through the construction of machines and then asked to reflect on their final product—what worked or did not work? Includes a teacher information booklet and a 15-page student building manual. Along with detailed illustrations, the manual includes background information about the history of hydraulic machines. Sturdy wooden pieces are pre-cut and pre-drilled. Complete for 30 students working in pairs.