/ 



590 BXPEEIMENT STATION RECORD. 



Kieters, but beyond that the hardpaa was intact. Drainage experiments in 

 brush-covered sand soil and in upland moors were fairly successful as were 

 also stump blasting experiments. It Is concluded that blasting is an effective 

 process for ditch digging, tree planting, and stump removal, and that the value 

 of subsoil blasting will depend upon the original productiveness of the soil, 

 the gain in productiveness, and the cost of the operation. 



Laws of Missouri relating to roads, highways, and bridges, 1913, C. 

 Roach (Jefferson City, ilo., 191S. pp. lS6-\-XIII).—X text of these laws is 

 given. 



Design and construction of earth roads in Iowa, T. R. Ago (Engirt . News, 

 71 {19U), No. 16, pp. 821-825, figs. 10).— The author deals with the work of 

 the Iowa Highway Commission relative to the Improvement of earth roads. 

 The cross-sections adopted for these roads are illustrated and explained, and 

 the limiting grades are given together with recommendations for alignment at 

 railway grade crossings and on curves. The use of the elevating grader is ex- 

 plained, and the cost of road work done by this machine and equipment in 

 Iowa is given. 



Forms for concrete work, A. Geaham (Ab$. in Concrete and Construct. En- 

 gin., 9 UOlJf), No. 5, pp. 339-34Jf). — Brief specifications are given for forms for 

 concrete work In general and for silos and bridges in particular. 



Knots, hitches, and splices, H. W. Riley (Cornell Reading Courses, 1 

 (1912), No. 8, pp. 45-88, figs. 201). — It is the purpose of this pamphlet to show 

 " as clearly as possible each step in the quickest and easiest methods of mak- 

 ing such knots, hitches, and splices as will be found most generally useful." 



Economical selection of belts and pulleys, W. F. Schaphorst (Power, 39 

 (1914), No. 11, pp. 588-590, figs. 4). — Data are given pertaining to the selection 

 of pulleys and belts for the purpose of obtaining the best results with the least 

 initial cost. Tables and curves are empolyed to assist in making a determina- 

 tion of pulley and belt sizes. 



Standard American gas and oil engine, automobile, and farm engine 

 guide, Stevenson and Brookes (Chicago, 1913, pp. 719+232+243, pis. 4, figs. 

 487). — This is an encycloijedia of the construction and operation of gas and oil 

 engines, containing information on questions relating to the care, construction, 

 and operation of gasoline and electric automobiles, farm and traction engines, 

 and a threshing machine, including a full description of its various parts and 

 their uses. Questions and answers for examination when applying for an en- 

 gineer's license are also given. 



Working up a boiler test, F. R. Low (Power, 39 (1914), No. 17, pp. 592- 

 595). — An efficiency test is» worked up item by Item in which some of the more 

 important features are the reduction to a dry coal and combustible basis; how 

 to find the evaporation per pound of coal as fired, per pound of dry coal, or of 

 combustible material under actual conditions, or from and at 212° F. ; and 

 different boiler efficiencies, boiler horsepower, and cost per 1,000 lbs. of steam. 

 A graphic representation of traction efficiency resulting from practical 

 tests and experience (Farm Machinery, No. 1175 (1914), P- 19, fig. 1). — ^A 

 curve showing the traction efficiency of the tractor, the percentage of slip 

 of drive wheels, and the number of plows, shows that with a 20.000-lb. tractor 

 under average conditions the slip with 2 plows is 1 per cent; with 8 plows. 8 

 per cent; with 10 plows, 20 per cent; and with 12 plows, 3S per cent. With 14 

 plows the tractor does not move, but spins the drivers. 



The modern gas tractor, its construction, operation, application, and 

 repair, V. W. Page (New York, 1913, pp. //7o, pis. 3. figs. 20/).— This is a 

 nontechnical treatise Intended as a guide for the average farmer and mechanic, 

 in which the endeavor has been made to present 8om« principles of design of 



