1 20 Barn Construction. 



and open valve B 2, thus emptying all the trough 

 entirely into a sewer or the liquid manure cistern, 

 which, of course, we must now provide. Between 

 the barn, and the discharge of the water thus 

 drawn o£F there should, of course, be a trap, which 

 trap is ventilated, as shown on page iii. This 

 plan overcomes all the objections which I have 

 mentioned in connection with individual water- 

 ing troughs. It supplies pure, fresh water which 

 is never allowed to stand or become contaminated 

 by the impurities of the air. It provides for a sim- 

 ple and inexpensive drainage that can never clog, 

 and does away with all floats in the trough that get 

 out of order. The troughs are covered with a 

 wooden cover a a, which I saw in operation in Mr. 

 James Forsyth's barn at Owego, N. Y. When a 

 cow wants a drink, she puts her nose against the 

 cover, raises it, and helps herself. Mr. Forsyth 

 assures me that the cows "catch on,' as he ex- 

 pressed it, very quickly. This keeps the trough 

 always clean and free from dust. The inlet and 

 discharge pipe are the same. The flow and dis- 

 charge comes straight from the main pipe into the 

 bottom of the trough, and is easily cleaned. A three- 

 fourths-inch pipe supplies the troughs, while the main 

 pipe is two to three inches, according to the number 

 of cattle and length of the stable. 



