GENERATING MECHANICAL POWER 89 



ter and the fall, lie can estimate the size and character 

 of wheel to supply. The penstock may be vertical or 

 placed on a slant. A galvanized pipe sufficient to carry 

 the necessary amount of water may be laid along the 

 bank, but it should be thoroughly well supported be- 

 cause a pipe full of water is heavy, and settling is 

 likely to break a joint. 



Galvanized piping for a farm penstock is not nec- 

 essarily expensive. It may be made at any tin shop 

 and put together on the ground in sections. The only 

 difficult part about it is soldering the under side of 

 the joints, but generally it may be rolled a little to one 

 side until the bottom of the seam is reached. 



The most satisfactory way to carry power from the 

 water-wheel to the farm buildings is by means of elec- 

 tricity. The dynamo may be coupled to the water- 

 wheel and wires carried any required distance. 



The work of installing electric power machinery is 

 more a question of detail than mechanics or electrical 

 engineering. The different appliances are bought from 

 the manufacturer and placed where they are needed. 

 It is principally a question of expense and quantity of 

 electricity needed or developed. If the current is used 

 for power, then a motor is connected with the dynamo 

 and current from the dynamo drives the motor. A 

 dynamo may be connected with the water-wheel shaft 

 at the source of power and the motor may be placed in 

 the power-house or any of the other buildings. 



The cost of farm waterworks depends principally 

 on the amount of power developed. Small machinery 

 may be had for a few hundred dollars, but large, pow- 

 erful machinery is expensive. If the stream is large 

 and considerable power is going to waste it might pay 

 to put in a larger plant and sell current to the neigh- 



