)917] 



RURAL ENGINEERING. 



589 



localities in France during 1916. The machines te.sted incliuled tractors, motor 

 [.■lows, and motor cultivators. 



Mechanical cultivation, R. Dessaisaix {Jour. Agr. Prat., n. scr., 29 {1916), 

 Xo. 20, pp. 3^1, 3.^2). — The more important results of plowing tests on hard, dry, 

 calcareous clay soil at Tours, France, with six tractors are given in the follow- 

 ing table: 



Tractor plowing tests. 



The more important results of plowing tests with four tractors on tenacious 

 calcareous clay soil containing hills with grades of from 10 to 16 per cent are 

 summarized as follows : 



Tractor tests on hilly soil. 



Eepcrt on demonstrations with motor tractors at York, 1915, J. Gilchkist 

 (f7n.ii;. Leeds and Yo'rk-'ihire Council Agr. Ed. [Pamphlet], 100 {1916), pp. 24, 

 figs. 8; abs. in Jour. Bd. Agr. [Londan], 23 {1916), No. 6, p. 600). — The general 

 results of one-hour plowing tests on medium loam and uniform sandy loam 

 soils with six internal-combustion tractors ranging in brake horsepower from 

 16 to 40, one 22-brake horsepower steam tractor, and a 10-horsepower motor 

 plow are reported. The number of furrows plowed at one time varied from 

 two to four. 



Motor plows and motor plowing, A. Amos {Jour. Roy. Agr. Soc. England, 76 

 {1915), pp. 74-91; abs. in Jour. Bd. Agr. [London], 23 {1916), No. 6, pp. 599, 

 600). — The use of the motor plow to meet war time conditions in England is dis- 

 cu.ssed, and general information is given regarding the organization, cost, and 

 economy of motor plowing. 



Engine plows, I. A. Weaver (Trans. Amer. Soc. Agr. Engin., 9 {1915), No. 1, 

 pp. 104-109, figs. 4). — This is a discussion of the more important factors enter- 

 ing into the design of engine plows. 



Experiments on mechanical cultivation at Grignon, F. Beethault {Ann. 

 J^cole Nat. Agr. Grignon, 5 {1914), pp. 5-205, figs, i.^).— This is a detailed re- 

 port of controlled experiments on mechanical cultivation at Grignon during 

 1913-14, giving results and conclusions. 



