abstracts: engineering 137 



Definitions and brief discussions occur under the following titles, 

 which are arranged alphabetically: 



Acid sludge, anthracene, artificial asphalt, artificial bitumens, asphalts, 

 asphaltenes, asphaltic petroleums, asphaltic cement, Baume gravity, 

 benzol, bitumen, bituminous, blown petroleum, carbenes, carbon bisul- 

 phide, carbon tetrachloride, coal tar, coke-oven tar, cracked oil, crack- 

 ing, cut-back products, dead oils, destructive distillation, dehydrated 

 tar, emulsions, fixed carbon, flux, free carbon, gas-house coal tar, gil- 

 sonite, grahamite, high-carbon tars, hydrocarbons, low-carbon tars, 

 malthas, malthenes, mineral rubber, naphthas, naphthalene, native 

 bitumens, oil asphalts, oil pitches, oil tars, paraffin naphthas, paraffin 

 petroleum, paraffin scale, paraffine, petrolenes, petroleums, petrolic 

 ethers, pitches, pyrobitumens, pyrogenetic, reduced petroleums or 

 reduced oils, refined tar, residual petroleums or residual oils, residual 

 tars, rock asphalt or bituminous rock, semiasphaltic petroleums, short, 

 tar pitches, tars, water-gas tars. C. S. Reeve. 



ENGINEERING. — Methods for the examination of bituminous road 

 materials. Prevost Hubbard and Charles S. Reeve. To be 

 published as Bulletin No. 38 of the Office of Public Roads, U. S. 

 Department of Agriculture. 



This bulletin describes methods now in use by the Office of Public 

 Roads for the examination of bitumiDous road materials. These are 

 given in detail with illustrations of practically all of the necessary appara- 

 tus; so that any intelligent person may, with a little practice, and the 

 proper equipments, make the desired tests. 



For the purpose of examination, bituminous road materials are classi- 

 fied as follows: (1) Petroleums and petroleum products, including resid- 

 ual petroleums, fluxes, oil asphalts, and fluxed or cut-back oil asphalts. 

 (2) Malthas. (3) Asphalts and other solid native bitumens, and asphal- 

 tic cements produced by fluxing same. (4) Tars and tar products. 

 (5) Mixtures of tar with petroleum or asphalt products, bituminous 

 emulsions, and factitious asphalts. (6) Bituminous aggregates, includ- 

 ing rock asphalts or bituminous rocks, bituminous concrete and asphalt 

 or other bituminous topping. 



A scheme of examination for each of the above classes is then dis- 

 cussed with relation to the particular tests applicable to each class. 



An appendix contains an itemized list of the necessary equipment for 

 a small laboratory, metric conversion tables, degrees Baume and specific 

 gravity, and Centigrade and Fahrenheit degrees comparison tables, 

 concluding with forms for reporting and recording tests. C. S. R. 



