498 CONSTRUCTION, FARM ENGINEERING, MECHANICS 



Average cost of windmills of different sizes, and areas irrigated by them in 

 Colorado (Fuller) 



Machinery and Motors 



Rules for widths of belting 



d = diameter of either driving or driven pulley in inches. 

 n = number of revolutions per minute of pulley considered. 

 Wi = width in inches of single leather belting or of 4-ply canvas or 4-ply 



rubber belting. 

 tf>s = width in inches of 5-ply canvas or of 5-ply rubber belting. 

 Wq = width in inches of double leather belting or 6-ply canvas or 6-ply rubber 

 belting. 

 H.P. = Horse-power to be transmitted by belt. 



Rule:— u'4 = 3000^^ 

 an 



Rules for determining size and speed of pulleys or gears 



The driving pulley is called the Driver, and the driven pulley the Driven. 

 To determine the diameter of Driver, the diameter of the Driven and its 

 revolutions, and also revolutions of Driver, being given. 

 Diam. of Driven X revolutions of Driven 



Revolutions of Driver 



Diam. of Driver. 



To determine the diameter of Driven, the revolutions of the Driven and diam- 

 eter and revolutions of the Driver being given. 



Diam. of Driver X revolutions of Driver 



Revolutions of Driven 



Diam. of Driven. 



To determine the revolutions of the Driver, the diameter and revolutions of 

 the Driven and diameter of the Driver being given. 



Diam. of Driven X revolutions of Driven t^ e t^ • 



r ^ ,-^- = Rev. of Driver. 



Diameter of Driver 



To determine the revolutions of the Driven, the diameter and revolutions of 

 the Driver, and diameter of the Driven being given. 

 Diam. of Driver X revolutions of Driver 

 Diameter of Driven 



= Rev. of Driven. 



If the number of teeth in gears is used instead of diameter, in these calcula- 

 tions, number of teeth must be substituted wherever diameter occurs. 



