Reviews. 



SUMMARIES OF THE LITERATURE OF STRUCTURAL 

 MATERIALS. III. 



Edwin C. Eckel. 



Armstrong, L. K. Portland and Natural Cements of the Pacific Northwest. 

 Mining, Vol. IX, pp. 134-41, 1902. 



Description of the materials and plant of the Pacific Portland Cement Co. The 

 plant is located fifty miles from Newport, Wash., and a mixture of clays, shales, and 

 limestone is used. Analyses of materials and product are given. 



Baker, I. O. A Study of Road- Building Gravels. Engineering News, Vol. 



XLVIII, pp. 345-8, igo2. 



Detailed discussion, by a leading engineering authority, of a fresh subject. The 

 requisites of a road gravel are: (i) the fragments should be so hard and tough as not 

 easily to be ground into dust by the impact of'wheels and hoofs ; (2) the pebbles should 

 be of different sizes, each in the proper proportion ; and (3) there should be inter- 

 mixed with the coarser particles some material which will cement and bind the whole 

 into a solid mass. These requisites are separately discussed at some length, and 

 eight typical and well-known road gravels are described. 



Brown, C. C, editor. Directory of American Ce7nent Industries attd Hand- 

 Book for Cement Users. 2d ed. 8vo, pp. 740. Price, $5. Municipal 

 Engineering Co., Indianapolis, Ind., 1902. 



A second (revised and enlarged) edition of this valuable work first published in 

 1901. 



A chapter on cement-testing gives, in addition to the methods adopted by the 

 American Society of Civil Engineers, the recent reports of the Board of Engineer 

 Officers (U. S. A.), on "Testing of Hydraulic Cements," and of the committee on 

 methods of cement analysis appointed by the New York section of the Society of 

 Chemical Industry. In the second chapter, dealing with cement specifications, sam- 

 ples are given of specifications in use by the War and Navy Departments, the New 

 York Central, Pennsylvania, and Philadelphia & Reading railroads, and the public- 

 works departments of several cities. Under the head of uses of cement are given data 

 on the methods and costs of mixing concrete-and-steel construction, cement pipes, 

 concrete blocks, etc. A long chapter on specifications for the use of cement quotes 

 various specifications covering most of the uses to which cement or concrete may be 

 put. Data on which to base estimates on cement work are given in detail. Several 

 typical laboratories for cement-testing are described. The technology of lime and 

 plaster is discussed more briefly. A large number of typical plants, manufacturing 

 Portland, puzzolan, or natural cements, is described. 



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