MACHINERY. 131 



is 4 inches, which is required to run 900 revolutions 

 per minute. Revolutions of shaft 200. 4 x 900 -r- 200 

 = 1 8, which is the diameter in inches of the pulley 

 required to drive the intermediate at proper speed. 



To find the length of belt for any two pulleys, add 

 the diameter of the two pulleys together, divide 

 their sums by two, and multiply their quotient by 3^. 

 Add the product to twice the distance between 

 the centres of the shafting, and the result will be the 

 required length of belt. 



Example : Two pulleys are 8 and 24 inches in 

 diameter, and 8 feet is the distance between the 

 centres of the shafting. 8 + 24 = 32, 32-1-2=16, 1 6 x 

 31^ = 52 inches = 4 feet 4 inches, and 4 feet 4 inches 

 4- 1 6 feet (twice the distance between the centres of 

 the shafting) = 20 feet 4 inches, which is the length 

 of belt required. 



It is also important that hot and cold water tanks, 

 and at least one washing-sink be in every factory. 

 These are best made of galvanized iron, painted on 

 the outside, with a large tap on the bottom of the 

 water tanks and a suitable plug in one end of the wash 

 sink. Wooden tanks or sinks are difficult to clean, 

 while wooden tanks lined with tin or galvanized 

 iron soon leak and cause a great deal of trouble. 



The following is a list of the utensils required, and 

 their estimated cost for a 500 cow cheesery : 



Uoiler, 20 h. p., two 6oo-gallon vats, two 12-hoop 

 gang presses, acidimeter, one 8oo-lb. scale of double 

 beam, one 5O-gallon weigh can, milk conductor, head 

 and pipe, two curd three-eighths inch knives, curd 



