p 



1920] RURAL ENGINEERING. 289 



breasts to be adequately stayed, not necessarily with adjustable stays; (5) sole- 

 plate of hind plow to be of good length ; (G) narrow share; (7) knife coulter and 

 separate skliiinier, also a nonswiiiging disc coulter secured to a singe flat stalk 

 and having conib,ined a skiuinTor giving 2 or 3 in. vertical adjustment; (8) arch- 

 backed beam, not dipping toward the ground, but carried parallel until almost 

 at the point of draft; (9) provision for dipping the nose of either plow inde- 

 pendent of the other; (10) good longitudinal distance between the bodies, up 

 to 30 in. in 2-f arrow plows; (11) not more than two wheels and a simple hind 

 carrier for transport; (12) wheels to be capable of being lubricated without re- 

 moval from axle; (13) rigid drawbar, giving liberal and fine lateral adjust- 

 ment; (14) simple self-lifting arrangement, having the fewest possible moving 

 parts; (15) provision for regulating depth of plowing otherwise than by lever 

 and quadrant; and (IG) no hexagonal nuts on any part of plow — all must be 

 square. 



The week of motor cultivation at Senlis, R. Greilsammer (Jour. Agr. Prat., 

 n. ser., 32 {I'JIU), ^'o. 39, pp. 189-192, figs. J,).— The mechanical details of the 

 different motor-plowing apparatus on demonstration at Senlis are described, it 

 being shown that the French manufacturers are tending to replace slow-speed 

 motors with light high-speed motors of greater flexibility and lower fuel con- 

 sumption. There were more machines burning kerosene than gasoline, but none 

 burning producer gas. 



Mechanical cultivation in 1019, G. Coupan (G6nie Civil, 15 {1919), Nos. 23, 

 pp. o51-r,65; 2.',, pp. 593-599; 25, pp. 611-622; 26, pp. 6.',5-648, flgs. ^/8).— This 

 report desx-ribes the mechanical details of the different tractors, motor plows, 

 and mechanical-plowing apparatus tested in France during 1919. 



Cultural care of plantations, vines, and groves for silage, R. Opazo G. 

 (Dir. Jen. Serv. Agr. [Chile] Bol. 49 (1919), pp. 35, figs. i5).— Machinery and 

 implements for the cultivation and care of silage crops are described and illus- 

 trated. 



Farm implements and machinery in France and North Africa, H. L. 

 Gnm-Es (U. S. Dcpt. Com., Bur. Foreign and Dom. Com., Spec. Agents Ser., No. 

 191 (1920), pp. 36). — This is a report on the markets for farm implements in 

 France and the French colonial territory in North Africa. 



It is stated that in certain classes of implements, notably hay and grain 

 harvesting machinery, manufacturers of the United States have dominated the 

 trade for many years and have reasonable assurance of being able to maintain 

 this position. The trade in some of the smaller types of implements, such as 

 plows, harrows, cultivators, grain drills, straw cutters, and land rollers, and 

 also in threshers and steam tractors, has hitherto gone largely to France and 

 other European manufacturers. Changed conditions in the markets for raw 

 materials and labor have furnished an opportunity for American exporters to 

 compete on more favorable terms in the sale of these machines. 



Useful data on reinforced-concrete buildings for the designer and esti- 

 mator by the engineering staff of the Corrugated Bar Company, Inc. (Buf- 

 falo, N. Y.: Corrugated Bar Co., Inc., 1919, pp. 216, figs. llJf).— This handbook 

 contains data and diagrams on reinforced concrete for the use of the designer 

 and estimator. It is intt-nded to supplement textbooks on concrete design 

 with the purpose of eliminating the manual labor involved in the repeated 

 application of formulas and diagrams to the determination of the dimensions of 

 a structure. 



Attractive design for a country house, .1. ii. Adrianzen (Building Age, ^2 

 {1920), No. 4, p. -'f6, figs. 2). — Piau drawings and brief specifications for a 

 country house are given. 



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