38 



Traction c ngiti es.—TraGiion plowing engines have, for a number of 

 years, been popularly supposed here to serve as a satisfactory substitute 

 for cattle and carabao in doing the heavy work on the sugar plantations, 

 A thorough test covering a period of several years has been made by the 

 Bureau of Agriculture in the use of traction engines, driven across the 



Fig. 5. — Two-section smoothing harrow. 



fields for drawing gangs of plows, harrows and rollers behind them. 

 These machines were of the ordinary type with top mounted engine con- 

 nected by a series of gear wheels from the engine shaft down to a large 

 gear on one of the diiving wheels and actuating the other driving wheel 

 through the axle and differential. They have generally ranged in weight 



Fig. 6. — Extra-heavy gang plow. (Avery'.s "Jumbo.") 



from 12 to 16 tons when the boiler and tanks were filled with water and 

 the bunkers with coal. They have given fairly satisfactory results on 

 level, sandy land where there were no rice dikes, irrigation ditches or 

 ant hills, and during the dry season when irrigation was available for 

 keeping the land in proper condition to plow. They have proven quite 



