1917] KUEAL ENGINEERING. 587 



Part 2 is a description of certain large deposits of diabase upon the nortli sliore 

 of Lal<e Huron. Part 3 is a report on road materials in Essex and Kent 

 counties. Ontario, and Part 4 is a report on road materials along a portion of 

 the north shore of Lalie Ontario. 



Reinforcement for concrete roads, J. R. Chambekltn (Cement Era, IJf {1916), 

 No. 11, p. 4-'f)- — A mathematical analysis of the stresses in concrete roads leads 

 to the conclusion " that that t.vpe of reinforcement would be most efficient 

 whose cross sectional area multiplied by the cube of the cosine of the angle 

 bet\^■oen the reinforcing meml>er and a line transverse to the roadway is a 

 maximum." 



Some factors in the Indiana road problem, G. E. Ma^rtin {Purdue Univ. 

 Dept. Engin., Highway Bui. 2 {1916), pp. 27, figs. 19). — This is a summary and 

 discussion of the various factors affecting the road problem in Indiana, includ- 

 ing road mileage, topography, climate, soil, road materials, population, area, 

 traCric, and finance. 



Report of the [Iowa] State Highway Commission for the year ended De- 

 cember 1, 1915 {Ann. Rpt. Iowa Uigliway Com., 2 {1915), pp. 221, figs. -55). — 

 This report deals with the organization, administration, road and bridge con- 

 struction work, expenditures, and technical investigations during 1915. 



Among other technical investigations one year of service tests on highway 

 briilge paints brought out the following tentative results : " First, as a class 

 the coal-tar paints are forming alligator cracks, but as yet are giving good 

 pro*^ection, with a single exception. The coal-tar paint which has been exposed 

 the longest time has more or less completely broken down, and there is evidence 

 of rusting beneath the paint film. Second, the asphalt paints are cracking and 

 <heoking on the approach of cold weather. There is yet no evidence of rusting 

 of the iron underneath. Third, the red leads in general, especially where there 

 is a large amount of inert material mixed in the pigment, are fading badly, 

 and in some cases checking, chalking, and cracking. This fact would point to 

 the recommendation that red lead paint be used in connection with a covering 

 coat of a more stable paint. These paints are in general wearing better than 

 the coal-tar or asphalt paints. Fourth, the sublimed white leads are as a rule 

 wearing well. There is some evidence of checking. Fifth, the sublimed blue 

 leads are in general wearing better than any of the other lead paints. Sixth, 

 the best grades of iron-oxid paints are standing out exceptionally well, while 

 the iron-oxid paints v.hich contain calcium sulphate or calcium carbonate are 

 showing signs of dissolution, leaving pit holes in the paint film. Seventh, 

 where the graphite and carbon paints are placed next to the iron there are 

 marked indications of corrosion or rusting. When used as a second coat over 

 a prime coat of first quality iron oxid or lead these paints appear to be very 

 serviceable. Eighth, the paints containing the highly inhibitive pigment, zinc 

 chromate or lead chromate, are standing the service tests exceptionally well. 



" The results thus far are such as to substantiate the requirements of the 

 standard specifications for paint of the Highway Commission. In general, the 

 paints which can be admitted under these specifications are wearing well, while 

 those which would be excluded under these specifications are proving to be 

 inferior in wearing quality and serviceability." 



Third annual report of the State Highway Commission of the State of 

 Maine {Ann. Rpt. Highway Corn. Maine, 3 {1915), pp. 195, fig. 1). — This is a 

 report of the work and expenditures on highway construction, maintenance, 

 and repair in IMaine from January 1 to December 31, 1915. 



How to rvin the gas engine — simplified, L. St. John {New York: Manhattan 

 Electric Supply Co., 1915, 4. ed., pp. 55, figs. 3). — This is a handbook for gas 

 engine owners, tractioneers, and motorists. 



