90 EXPERIMENT STATION RECORD. 



freeboard of 1 in. for each foot iu diameter. By a mathematical analysis he 

 shows that " any semicircular flume will carry 36 per cent more when running 

 full than when running with a freeboard of 1 in. per foot of diameter." 



Examples are given to illustrate the use and flexibility of the tables. 



Corrugated iron construction on the Sacramento Valley irrigation project, 

 E. C. Mills {Enyin. News, 11 U91-'i), No. 4, pp- 11^-116. fiys. 4).— This article 

 describes the water-distribution structui-es on this project, which for perma- 

 nent construction consist only of conei"ete and corrugated iron or a combination 

 of the two. The features especially emphasized are corrugated pipe headgate 

 construction, corrugated pipe delivery boxes, lateral road crossings, inverted 

 siphons for natural drainage, road drainage structures, and sheet-iron flumes. 



A study of economic conduit location, C E. Hickok (Proc. Amcr. Soc. Civ. 

 Engin., 39 (1913), No. 19, pp. 218.5-2190, figs. 2; Engin. and Contract., 41 {19W, 

 No. 2, pp. 80, 81, fig. 1; Engin. Rcc, 69 (1914), No. 3, pp. 83, 84, figs. 2).— This 

 article includes a diagram which gives the equivalent lengths from an economic 

 standpoint of various types of conduits and a discussion of its application in 

 the economic location of conduits. 



A treatise on roads and pavements, I. O. Baker (New York and London, 

 1913, 2. ed., enl., pp. 698, figs. 171). — The object of this book is to give a discus- 

 sion from the point of view of the engineer of the pi'inciples involved in the 

 construction of country roads and city pavements. It is attempted to show 

 that the science of road making and maintenance is based upon well established 

 elementary principles, and that the art depends upon correct reasoning from 

 the principles rather than in attempting to follow rules or methods of con- 

 struction. " In some cases practical experience has not yet determined the 

 best method of procedure, and in these cases the conflicting views with th<e 

 reasons for each are fully stated." 



Considerable space is given to the economics and location of country roads 

 and to the construction and maintenance of earth roads. The topics discussed 

 are road economics, road location, earth roads, gravel roads, broken-stone roads, 

 miscellaneous roads, equestrian roads and horse-race tracks, pavement eco- 

 nomics, street design, street drainage, curbs and gutters, pavement foimdations, 

 asphalt pavements, brick pavements, cobblestone pavement, stone-block pave- 

 ment, wood-block pavements, comparison of pavements, sidewalks, bicycle paths 

 and race tracks, and automobile roads and concrete pavements. 



A glossary of road terms, H. P. Boulnois (Sut^eyor, .^^ (1913), Nos. 1136, 

 pp. 621-626; 1137, pp. 663-667; 1138, pp. 700, 701; 1139, pp. 728-730) .—This is 

 a compilation of terms which are used in connection with English road con- 

 struction. 



The principles of the application of power to road transport, H. E. Wim- 

 PEBLS (London, 1913, pp. XV-^ISO, pis. 5, figs. 20). — This work deals with the 

 Itrinciples of the application of power to road transportation. 



A general survey of the subject, taking up the use of steam, internal combus- 

 tion, and electrical power for transportation, and discussing necessary power 

 per ton mile and resistance to motion relative to loads, speeds, wheel diameters, 

 tires, etc., is followed by a discussion of power, speed and resistance measure- 

 ment, road tests, and power loss in engine friction and in transmission. Types of 

 steam and internal combustion engines and vehicles on which they are used 

 are described, and the relationship of engine dimensions and gear ratios to 

 v/ork and the proper design of vehicles are discussed iu some detail. 



Experimental road construction in Scotland, J. W. Smith and D. Ron.\ld 

 (Surveyor, 45 (1914), No. 1147, pp. 44-49, figs. 4).— A draft of specifications and 

 conditions for this work is given. 



