KUKAL ENGINEERING. 



189 



Under the test conditions it is concluded that all the outfits may be classed 

 together as regards depth of plowing and plowing capacity. On damp and 

 slippery soils two of the tractor outfits experienced considerable difficulty in 

 operation, and the work of none of the outfits except the cable plow was 

 entirely satisfactory on damp ground. Difficulty was generally experienced on 

 steep grades, but the American plow arrangements which permit one or more 

 of the shares to be raised was used with success on grades. 



The cable system was particularly successful on stony soil, owing to the 

 elasticity of the cable, but all of the outfits were sufficiently elastic in some of 

 their main parts to do fairly good work on stony soil. The tractors were the 

 most flexible for the different operations, but their broad wheels left a greater 

 trace and were apparently more injurious to the soil than were those of the 

 motor plows. The tractor outfits consumed the greatest amounts of fuel per 

 imit volume of moved soil, followed in order by the motor plows and the cable 

 outfit. 



Report of international tests of mechanical cultivating apparatus in 

 Tunis {Bid. Dir. G6n. Agr., Com. ct Colon., Tunis, 18 (1914), No. 79, pp. US- 

 SOS, pis. 30). — A large number of mechanical cultivating implements are de- 

 scribed and illustrated, and tests of outfits, including tractors, motor plows, and 

 scarifiers, are reported. The test results, including the results of dynamometer 

 tests, are given in tabular form. The more important results are summarized 

 in the following table : 



Results of tractor, motor ploic, and scarifier tests. 



Type of outfit. 



Tractor 



Do 



Do 



Do 



Do 



Do 



Do 



Do 



Do 



Motor plow 



Do 



Do 



Scarifier (plowiiifj 9.85 in.) 

 Scarifier (plowing 7.90 in.) 

 Scarifier (plowing 7.10 in.) 



Indicated 

 horse- 

 power. 



•10 to 50 



80 



55 to 60 



60 



40 



60 



33 to 40 



30 



45 



80 to 105 



10 to 20 



42 to 50 



Average 



required 



drawbar 



pull at 3.3 



ft. per 



second 



plowing 



7.9 in. 



Pounds. 



3,2)0 

 5,030 

 4,300 

 2,060 

 2,200 

 2,260 

 3,960 

 1,720 

 6,160 

 1,760 

 5,720 



Plowed in 

 10 hours. 



I erf .5. 

 12.3 

 17.3 

 14.8 

 16.8 

 6.9 

 13.6 

 9.4 

 11.1 

 11.4 

 22.2 

 4.9 

 19.8 

 3.80 

 3. 96 

 5.70 



Fuel con- 

 sumption 

 per acre. 



Gallons. 

 4.17 

 3.45 

 5.40 

 3.22 

 6.64 

 5.17 

 4.32 

 5.80 

 6.76 

 2.83 

 3.99 

 2.28 

 7.8 

 9.6 

 6.8 



Type Of 

 fuel. 



Essence. 



Do. 

 Petrol. 



Do. 

 Kssence. 

 Petrol. 



Do. 



Do. 



Do. 

 Essence. 



Do. 



Do. 



Do. 



Do. 



Do. 



Silos and silage in Colorado, II. E. Dvorachek {Colorado 8ta. Bui. 200 

 (1914), PP- 3-21, figs. 8). — This portion of the bulletin sets forth some of the 

 advantages of silos as they apply to Colorado conditions and the essentials to 

 be considered in the selection of a suitable silo for that State. In this con- 

 nection various types of silos commonly used are discussed as to their merits. 



The homemade stave silo is said to be generally a costly experience. The 

 patent stave silo is considered thoroughly established, but its measure of suc- 

 cess is said to depend largely upon the method of construction, quality of 

 material used, and tlie care and attention given it. Otlier wooden silos, includ- 



