686 



EXPERIMENT STATION RECORD. 

 Results of mechanical plotoing tests. 



[Vol. 35 



Type of outfit. 



Depth of 

 plowing. 



Width of 

 plowing. 



Average 



speed 

 per hour. 



Area 

 plowed 

 per hour. 



Fuel consumption. 



Per hour. 



Per 



hectare. 



Motor cultivator 



Motor plow 



Tractor 



Do 



Do 



Do 



Do 



Do 



Do 



Do 



Do 



Do 



Do 



Do 



Centi- 

 meters. 

 3.5 

 14.4 

 15.0 

 16.0 

 24.0 

 15.8 

 18.1 

 13.2 

 12.3 

 16.1 

 18.0 

 14.2 

 15.4 

 16.5 



Meters. 

 1.00 

 .56 



.59 

 .57 

 .59 

 1.50 

 .99 

 .99 

 1.25 

 1.19 

 1.17 

 1.20 



Meters. 

 4,. 572 

 4,032 

 2,952 

 2,880 

 2,916 

 2, 952 

 4,860 

 1,728 

 3,132 

 3,024 

 2,700 

 2,880 

 2,844 

 3,060 



Square 

 meters. 

 3,165 

 1,346 

 1,306 

 2,043 

 1,214 

 1,054 

 1,540 

 1,830 

 2,116 

 2,052 

 2,280 

 2,134 

 2,110 

 2,371 



Kilo- 

 gram •i. 

 3.55 

 5.98 

 5.42 

 7.73 

 5.83 



10.42 

 8.70 

 4.43 

 8.12 

 9.40 



10.01 

 6.89 

 6.74 

 7.04 



Kilo- 

 grams. 

 11.2 

 44.4 

 41.5 

 37.8 

 48.0 

 98.8 

 56.5 

 24.2 

 38.4 

 45.8 

 43.9 

 32.3 

 31.9 

 29.7 



Power required for grinding Pennsylvania and Argentine cereals in flour 

 mills, D. W. Dedrick (Ann. Rpt. Penn. State Col. 19U, pp. 123-133, pis. 10).— 

 Tests to determine the relative amount of power required for grinding winter 

 and spring wlieat, the effect on power requirements for the mill occasioned by 

 the conditioning of wheat by the application of moisture to the wheat hull, 

 and the power required for grinding corn and other grains are reported. 



It was found " that the winter wheat, conditions being equal, takes con- 

 siderably less power than spring wheat, and again tempered or conditioned 

 wheat less power than dry. Also that the mills with longer or more roll .sur- 

 face take less power than with shorter or less roll surface, as a comparison 

 of the four tests on spring wheat shows that the five-break, ten-reduction mill 

 takes the least and the three-break, five-reduction mill, the most power. The 

 dry wheat takes more power than the conditioned wheat to whicii had been 

 added 3 per cent of water and lying six hours to mellow. . . . 



" It was found that when the brushes or scrapers were adjusted, as is usual 

 against the rolls to scrape off material adhering to them in crushing, the rolls 

 took on an average 27 per cent more power than when running with the scraper 

 off. However, in grinding with full load this relation would be changed to 

 about 8 per cent of the power to the rolls. . . . 



" It required a little over 38 per cent more power to grind the same quantity 

 of Argentine corn in the same time to the same degree of fineness than for the 

 Dent variety. The second grinding took on an average 68 per cent more power 

 than the first grinding. Power for grinding ordinary white corn is practically 

 the same as that for Yellow Dent. . . . 



" The graphic chart shows that there were differences in cleaning wheat, 

 also that the corn took less power for cleaning than wheat. . . . The winter 

 wheat took 50 per cent of the power to the scourer, the spring wheat dampened 

 47.73 per cent, and the spring wheat dry 45.24 per cent, while the corn took 

 40.3 per cent. . . . 



" In the large class of mills the proportion of roll surface and other ma- 

 chinery per barrel is generally considerably less than that for a small mill, 

 and is owing to a more minute division of and consequently a more equitable 

 distribution of stock throughout the mill. A 25, 50, or 75 barrel mill will 

 use 1.8 to 2 in. per barrel or even more, whereas a 500 or 1,000 barrel mill 

 will use 1.7 to 1.6 in. or even less per barrel and consequently somewhat less 



