472 



ENGINEERING ON THE FARM 



After Link Belt Co. 



Bevel gearing 



Fig. 362 



gearing (Fig. 364) is a metal pulley the 

 surface of which is in contact with a paper- 

 or rawhide-covered pulley. Such gears 

 are used only where it is desirable to have 

 slippage or to prevent undue strain or 

 breaks, and will transmit only a limited 

 amount of power. 



Quadrant or triangle gearing. Quadrant 

 or triangle gearing is used to transmit 

 power in which the motion is reciprocating. 

 The power of a windmill or gas engine 

 which has been transferred to an up-and- 

 down motion may be transmitted to a 

 pump 75 to 100 feet distant, the transfer 



(Fig. 363) are used for shafts 

 not in the same plane and 

 usually at an angle. The 

 smaller of the wheels in a 

 cog gear is known as a 

 pinion. Cog gears are noisy, 

 expensive to repair when a 

 tooth breaks, and dangerous 

 if not protected by housings. 

 Friction gearing. Friction 



After Link Belt Co. 



Fig. 363 . Worm gearing 



Fig. 364. 



After Link Belt Co. 



Friction gearing 



wires being overhead out of the 

 way. 



Circular and reciprocating motion, 

 a) Connecting-rod and crank shaft: 

 Power may be delivered as generated 

 in a back-and-forth or reciprocating 

 motion and at once transferred to 

 circular motion, as by the connec- 

 ting rod and crank shaft of a steam 

 or gas engine. 



b) Pitman rod: Power may be 

 delivered in circular motion and 



