890 EXPERIMENT STATION EECOED. 



described. These outlets are 4 ft. 4 in. in diameter and are .subjected to 

 velocities of 60 ft. per second or higher. The purpose of such surfacing was 

 " not so much that of waterproofing as to fill all the minute voids in the surface 

 of the outlets, so as to prevent, if possible, the erosion caused by the formation 

 of vacuum in .small voids or pockets." 



The results from one year's service tests are taken to indicate " that the use 

 of this tar coating gave thoroughly satisfactory results." 



The use of concrete for protecting wood-stave pipe, K. A. Hebox {West. 

 Eng'm., 7 {1916), No. 1, pp. 27-29, figs. Jf.). — This article describes the remodeling 

 of two partially decayed wood-stave pipe lines in Colorado. Repairs were 

 made by covering the pipe with concrete. Cost data are included. 



Methods for the determination of the physical properties of road-building 

 rock, F. H. Jacksox, Jb. {V. S. Dept. Agr. Bui. 5-J7 {1916), pp. 27, figs. 12).— 

 This bulletin is a partial revision of Office of Public Roads Bulletin 44 (E. S. R., 

 27, p. 587). It is limited to a description of methods employed by the Office 

 of Public Roads and Rural Engineering for testing rock for road building, 

 and *' is intended to serve as a more or less permanent laboratory manual for 

 those who have occasion to make such tests." It deals with the physical prop- 

 erties of road-building rock and physical tests of road materials, including 

 specific gravity, weight per cubic foot, water absorption, Deval abrasion test, 

 hardness test, toughness test, cementing value test, and compression test. Two 

 appendixes deal with the .selection and shipment of samples and laboratory 

 equipment. 



Proceedings of the thirteenth annual meeting of the Ontario Good iBoads 

 Association, 1915 {Proc. Ontario Oood Roads Assoc, 13 {1915), pp. 201, pis. 

 S). — These proceedings include the following special papers: Road Construc- 

 tion in New York State, by G. C. Diehl ; Wearing Surfaces, by G. W. Tillson ; 

 Finance, by S. L. Squire ; Road Laws, by B. Michaud ; Bridges and Culverts, by 

 L. E. Allen; State Roads of New Jersey, by R. A. Meeker; Road Foundations, 

 by J. Duchastel; Machinerj', by F. E. Ellis; Dust Prevention, by W. W. Crosby; 

 Maintenance of Roads, by G. Henry; Road Organization, by G. H. Henry; 

 Road Location, by C. R. Wheelock ; Gravel and Stone Roads, by C. Talbot ; 

 The Evolution of the Asphalt Pavement in Toronto, by G. Powell ; Good Roads 

 and the Contractor, by H. T. Routly ; Traffic and Its Relation to Road Construc- 

 tion, Maintenance, and Cost, by "VV. D. Sohier; Brick Roads and Streets, by 

 E. A. James; Bituminous Construction, by J. Pearson; Concrete Roads and 

 Streets, by H. S. Van Scoyoc; and Creosoted Wood Block Pavements, by 

 A. F. IMacallum. 



Annual report on highway improvement, Ontario, 1914 {Ann. Rpt. High- 

 irag Imp. Ontario, 191.'t, pp. 110, figs. 36). — ^This report deals with the follow- 

 ing subjects related to highway improvement : Expenditure by counties, model 

 and experimental roads, bituminous roads, operation and care of machinery, 

 cost keeping and accounting, bridges and abutments, types of county roads, 

 broken stone roads, gravel roads, drainage, the geology of road building 

 materials, the testing of stone and gravel, culverts, explosives, and asphaltic 

 deposits. 



Report of the surveyor general for the year 1914, A. A. Spowebs {Ann. 

 Rpt. Dept. Pub. Lands Queensland, 1914, PP- 84-98, pis. 5). — The activities and 

 expenditures of the Queensland surveyor general's office for 1914 are reported, 

 together with the reports of district surveyors. These include surveys of 

 lands, roads, etc. 



When the boiler needs attention {Poiver Farming, 25 {1916), No. 1, pp. 42-44- 

 figs. 5). — Methods of repairing boilers of steam tractors are described and 

 illustrated. 



