Download presentation
Presentation is loading. Please wait.
Published byAdele Skinner Modified over 9 years ago
1
By Michael B and Stewart G
2
Four events that have to happen in order for an engine to work Intake Compression Power exaust
3
How has the engine improved efficiency Mechanization has helped make production of farm products possible with a great reduction in the labor required. In 1800, about 55 worker-hours were needed to produce an acre of wheat. In 1875, using steam traction engines and horses, about 15 worker-hours were needed. In 1925, using early gasoline tractors, an acre of wheat could be produced in about five worker- hours. Modern machinery requires a little more than one worker-hour to produce the same acre of wheat.
Similar presentations
© 2025 SlidePlayer.com. Inc.
All rights reserved.