790 EXPERIMENT STATION RECORD. [Vol. 43 



Public Roads (U. S. Dept. Agr., Public Roads, 3 {1920), No. 26, pp. 36, figs. 

 32). — This number of this periodical contains the following articles: Four 

 Years of Road Building under the Federal-aid Act, by T. H. MacDonald; 

 Federal Road Building in the National Forests of the West, by L. I. Hewes; 

 The Selection and Comparison of Federal-aid Road Types, by E. W. James ; 

 and Federal-aid Allowances : Project Statements Approved and Agreements 

 Executed in May, 1920. 



The development of an -economic theory of highway transportation, R. C. 

 Barnett (Engin. and Contract., 5^ (1920), No. 9, pp. 201-205, figs. 6).— The 

 author attempts to set forth the basis for the development of an economic theory 

 of highway transportation, and derives certain formulas to show the relation 

 between costs of roadway, motive power, and vehicle elements. 



Reinforcing concrete pavements on California highways (Engin. Neios- 

 Rec, 84 (1920), No. 26, p. 1255, fig. 1). — The progress results of experiments 

 being conducted by the California Highway Commission show that on the 

 theory that the primary function of concrete pavement reinforcement is to pro- 

 vide a bond across the longitudinal cracks, the preferred plan is to use f-in. 

 twisted barsjilaced transversely on 18-in. centers. This size and spacing was 

 found to meet most nearly the requirement of maximum bond across such 

 cracks for the minimum outlay in steel. 



More recent experiments have resulted in the addition of a longitudinal run 

 of §-in. bars along each edge of the pavement. On the basis of reinforcing 

 steel at 5 cts. per pound, delivered, this reinforcing cost $1,770 per mile. 



Selection and cost of farm machinery, F. M. White (Rpt. Md. Agr. Soc, 

 4 (1919), pp. 285-292). — General information on the subject is given. 



Proper treatment of transmission belts, E. J. Black (Cement and Engin. 

 News, 32 (1920), No. 7, pp. 26-28, figs. 2). — It is pointed out that improper 

 lacing is probably the most common mistake made by users of belts, and what is 

 regarded as the correct method is explained in detail. A table is included for 

 finding the horsepower of a belt. 



OflBcial gasoline analyses, 1920, R. E. Rose and E. T. Casler (Fla. Quart. 

 Bui. Agr. Dept., 30 (1920), No. 3. pp. 90-116).— This section of this bulletin con- 

 tains the results of official analyses of 331 samples of gasoline collected for 

 inspection in Florida during the second quarter of 1020. 



OflBcial kerosene analyses, 1920, R. E. Rose and E. T. Casler (Fla. Quart. 

 Bui. Agr. Dept., 30 (1920), No. 3, pp. 117-126).— This section of this bulletin con- 

 tains the results of official analyses of 109 samples of kerosene collected for 

 inspection in Florida during the second quarter of 1920. 



White coal, A. Turpain (Vers la HouiUc Blanche. Paris: H. Dunod d E. 

 Pinat, 1919, pp. XI-\-76). — This publication deals with the development and use 

 of electrical power in France, particularly for farm purposes, and gives the 

 results of considerable study of the water-power resources in France. 



How to let in the sunshine, W. G. Kaiser (Farm Mechanics, 3 (1920), No. 

 1, pp. 22-25, figs. 8). — Data on the design of hog houses are given, including 

 cross sectional drawings of several types. It is shown that the horizontal dis- 

 tance as measured from a point on the floor directly below the windows to the 

 north wall is an important factor to be considered when determining the proper 

 location of the windows, it being assumed that the houses face the south. 



A map of the United States marked off in degrees of latitude is included as 

 an aid to the builder, and a table showing the height in the varying latitudes 

 at which to locate windows for hog houses 8, 10, and 12 ft. in width is given. 



The Missouri poultry house, H. L. Kempstee (Missouri Sta. Circ. 93 (1920), 

 pp. 9, figs. 7). — This bulletin describes and diagraramatically illustrates poultry 

 house design, especially for Missouri conditions. Since the average farm 



