<Li> Water--low volume, large head </Li> <Li> Efficiency--80 to 90% </Li> <Tr> <Td> Overshot <Ul> <Li> Vertical wheel with horizontal axle </Li> <Li> The water hits near the top of the wheel and in front of the axle so that it turns away from the head race </Li> <Li> Driving surfaces--buckets </Li> <Li> Water--low volume, large head </Li> <Li> Efficiency--80 to 90% </Li> </Ul> </Td> <Td> Diagram of overshot waterwheel showing headrace, tailrace, water, and spillage . </Td> </Tr> <Ul> <Li> Vertical wheel with horizontal axle </Li> <Li> The water hits near the top of the wheel and in front of the axle so that it turns away from the head race </Li> <Li> Driving surfaces--buckets </Li> <Li> Water--low volume, large head </Li> <Li> Efficiency--80 to 90% </Li> </Ul>

Where are persian wheel and spinning wheel used what would be the effects if they were not invented