134 THE OLIVER PLOW BOOK 



compared with the thin layer of ^" of steel on the soft 

 center steel mouldboard, one can readily see that a 

 chilled mouldboard will outlast three steel. This fact 

 is what gave rise to the statement that one chilled plow 

 will outwear three steel in gritty conditions. 



Properly chilled plows are not affected by rust. The 

 iron being needle crystal in form merely corrodes on the 

 end of the needle. The operator can scour a chilled 

 plow that has been exposed to the deteriorating weather 

 conditions for a long time in a few feet of travel with the 

 bottom in the ground. This feature of chilled plows is 

 in great contrast to steel plows which rust so easily that 

 the rust occasioned by a few days' exposure often makes 

 them hard to scour. 



From the foregoing discussion on chilled and steel 

 plow bottoms, it is obvious that many farmers can use 

 both types of plows to good advantage, and where it is 

 possible to interchange the steel wearing parts with 

 chilled, the advantage is double because of the saving in 

 expense. 



Oftentimes it is necessary to plow in the summertime 

 when the ground is hard and dry. The chilled share 

 being much more resistant to the hard earth will enable 

 a plowman to do better work by using chilled shares. 

 I 



Experiments have been tried many times to determine 

 the amount of wear of chilled and steel shares. We 

 quote one experiment that was tried for this purpose and 

 the result. A two-bottom tractor plow was equipped 

 with a chilled and a steel share of the same size and type, 

 one bottom being equipped with a steel share and the 

 other with a chilled share. The ground in which the 

 experiment was tried was a sandy soil, very hard, with 



