19171 



RURAL ENGINEERING. 



189 



pates ; part 2, Plain Concrete, deals with proportions and quantities of materials, 

 construction of forms, and mixing and handling concrete ; part 3, Reinforced 

 Concrete, deals with general principles and strength of reinforced concrete; 

 part 4, Miscellaneous Matters, deals with concrete surface finishes, stucco and 

 plaster work, waterproofing and coloring concrete, and casting in molds; and 

 part 5, Typical Applications of Concrete, deals with sidewalks, floors, and 

 roads ; tanks, cisterns, and silos ; and small highway bridges and culverts. 



Official tests of mechanical cultivation {Jour. Agr. Prat., n. ser., 29 {1916), 

 No. 13, pp. 230-232, figs. 2). — Tests on the cultivation of very light sandy soil 

 with a 16-horsepower and a 25-horsepower tractor are reported. The former 

 weighed 2,800 kg. ( about 3 tons ) and had a horizontal single-cylinder motor run- 

 ning at about 400 revolutions per minute. The latter weighed 4,700 kg. and had 

 a horizontal two-cylinder opposed motor running at about 550 revolutions per 

 minute. The test results are given in the following table : 



Mechanical cultivation tests. 



Type of cultivator. 



3-bottom plow 



4-bottom plow 



12-tooth cultivator, soil plowed 



one week 



12-tooth cultivator, soil recently 



plowed 



12-tooth cultivator on fallow. . . 



iJ-disk harrow on fallow 



14-disk harrow, soil recently 



plowed 



Tractor, 

 horse- 

 power. 



Depth of 

 cultiva- 

 tion. 



Centi- 

 meters. 

 10.0 

 20.9 



C.5 



11.0 

 7.0 

 4.0 



10.0 



Width of 

 cultiva- 

 tion. 



^^eters. 

 0.07 

 1.26 



2.00 

 2.00 

 2.10 



2.10 



Average 



speed per 



hour. 



Meters. 

 3,276 

 2,736 



3,348 



3,348 

 3,348 

 3,348 



3,276 



Area cul- 

 tivated 

 per hour. 



Square 



meters. 



2,325 



2,460 



4,762 



4,762 

 4,762 

 5,000 



4,958 



Fuel consumption. 



Per hour. 



Kilo- 

 grams. 

 6.66 

 6.72 



4.43 



4.84 

 4.02 

 4.06 



Per 

 hectare. 



Kilo- 

 grams. 

 24.3 

 27.3 



9.3 



10.1 



8.2 

 8.1 



Official tests of mechanical cultivation {Jour. Agr. Prat., n. ser., 29 {1916), 

 No. 15, pp. 262-264, figs. 2).— Tests of a 3-wheeled tractor with a 4-cylinder 

 vertical motor rated at 20 horsepower in plowing, rolling, and harrowing on a 

 heavy clay soil are reported. The two front wheels, 0.62 meter (24.4 in.) 

 in diameter, are guide wheels and the rear wheel, 1.52 meters in diameter, 

 is a driver. The total weight of the tractor is 2,800 kg. (about 3 tons). The 

 test results are given in the following table : 



Mechanical cultivation tests. 



Cultivating apparatus. 



Depth of 

 cultiva- 

 tion. 



Width of 

 cultiva- 

 tion. 



Area culti- 

 vated per 

 hour. 



Fuel consumption. 



Per liour. Per hectare. 



Average 



speed per 



hour. 



2-bottom plow 



Do 



4-bottom plow 



3-bottom plow 



Do 



Do 



Do 



13-tooth cultivator 



13-tootIi cultivator and roller . 



48-tooth harrow on plowed soil 



13-tooth cultivator on fallow 



soil 



Centime- 

 ters. 

 15.7 

 22.7 

 17.5 

 15.0 

 20.4 

 13.0 

 18.0 

 10.0 

 10.0 

 4.5 



10.0 



Meters. 



0.61 



.58 



1.00 



.94 



.94 



.94 



.88 



1.56 



1. 56 



2.00 



1.56 



Square 

 meters. 

 2,083 

 1,087 

 1,887 

 2,421 

 2,364 

 1,886 

 1,744 

 3, 333 

 3,225 

 6,900 



3,186 



Kilograms. 

 8.60 

 5.40 

 5.50 

 6.90 

 7.26 

 7.86 

 8.51 

 6.32 

 7.59 

 8.22 



6.27 



Kilograms. 

 41.2 

 49.6 

 29.1 

 28.5 

 30.7 

 40.9 

 49.0 

 18.9 

 23.5 

 11.9 



19.8 



\ 



Meters. 

 6,292 

 2,592 

 2,772 

 3,600 

 3,492 

 2,772 

 2,700 

 2,988 

 2,880 

 5,400 



