RURAL ENGINEERING. 487 



Earthwork haul and overhaul, J. C. L. Fisii (A^eto York and London, 1913, 

 pp. XIV-\-165, pis. 3, figs. 50). — Part 1 of this book deals with the computation 

 of earthwork haul and overhaul and with the use of the mass diagram in 

 planning distribution. Part 2 deals with the economic distribution of material 

 along the profile by means of the mass diagram. 



Some experiments with mortars and concrete mixed with asphaltic oils. — 

 Some further tests of oil-mixed concrete, A. Taylor and T. Sanbokn {Proc. 

 Amcr. 8oc. Civ. Engin., 30 (1913), No. 3, pp. 335-363, fig. 1; ahs. in Concrete- 

 Cement Age, S {1913), No. 1, p. 27). — Tests of oil-mixed concrete using western 

 oils yielded somewhat different results from those obtained in previous experi- 

 ments by Page (E. S. R., 28, p. 85), The conclusions drawn from these tests 

 are as follows : 



(1) Oil-mixed concrete containing 5, 10, or 15 per cent of oil, by weight of 

 cement, is more permeable under pressures from 20 to 60 lbs. per square Inch 

 than concrete without incorporated oil, and oil-mixed mortar containing 10 per 

 cent of oil is more permeable than plain mortar under pressures of 10 and 20 

 lbs. per square inch. (2) Oil-mixed mortars containing oil up to 25 per cent 

 show slightly less absorption of water than plain mortar, except that with the 

 most viscous oils the mortar becomes more absorptive, and absorption is not an 

 index of the permeability. The absorption decreases with the increase in the 

 quality of oil. (3) The tensile strength of oil-mixed mortar is decreased con- 

 siderably below that of plain mortar, and decreases with the increase in the 

 quantity of oil. (4) The compressive strength of oil-mixed mortars follows 

 lines similar to those of the tensile strength, but with a greater decrease in 

 strength with the quantity of oil. (5) The strength decreases with the viscosity 

 of the oils, and with the most viscous oils it requires considerably more water 

 to keep a mixture at normal consistency than is required in the fluid oil mixtures. 

 (6) The relative decrease in strength with the increase in the quantity of oil 

 in mortars is less in 50 days than in 28 days. 



Concrete on farms, J. Wilson (Jour. Dept. Agr. Victoria, 11 (1913), No. 9, 

 pp. 570-573, figs. 3). — This article illustrates and briefly describes machines for 

 making concrete blocks and fence posts and describes the construction of con- 

 crete block silos. 



[Information reg-arding concrete farm structures] (Concrete-Cement Age, 

 S (1913), No. 1, pp. 36-39, figs. 7).— A collection of articles which illustrates 

 and describes the construction of concrete dipping vats for hogs and sheep, 

 small concrete ice houses, sanitary floors in dairy barns, sanitary floors for 

 poultry, sheep, and hog houses, and a concrete cooling vat. 



A treatise on the inspection of concrete construction, J. Cochran (Chicago. 

 1913, pp. XV-\-595, figs. 26).— It is the purpose of this work to set forth in 

 detail the principal ix)ints upon which an inspector of concrete construction 

 should be informed. The instructions are said to apply to building construction 

 and to practically any type of reinforced concrete construction. The subject 

 matter is presented under chapters dealing respectively with the inspection 

 of hydraulic cement, sand, stone, and miscellaneous concrete materials; pro- 

 portioning and mixing concrete; forms, molds, centering, and falsework; steel 

 reinforcement; concreting; surface finishes for concrete work; waterproofing 

 for concrete work ; concrete sidewalk, curb, and pavement construction ; con- 

 crete products; and molding and driving concrete piles. 



The warning is given to use judgment in applying these suggestions, and not 

 to use them in opposition to specifications. 



Farm gas engines, C. F. Hirshfeld and T. C. Ulbricht (New Yoj'k and 

 London, 1913, pp. VII-\-239, figs. 188).— This book is intended primarily to serve 



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