1. What is the difference between the treadle and a motor-power machine?
2. How is power secured from water in a water motor? Or what is the source of power utilized by a water motor?
3. How do you determine the size of pulleys to use on the gasoline engine and on the device it is to operate?
4. What are some indications that a gasoline engine or automobile motor is not running properly?
5. What are the kinds of batteries, and to what uses is each best suited?
6. Do batteries need care? If so, what care?
7. How is acetylene gas made? Describe the device for making it.
8. How is gas for household use made from gasoline?