ABSTRACTS 



Authors of scientific papers are requested to see that abstracts, preferably 

 prepared and signed by themselves, are forwarded promptly to the editors. 

 Each of the scientific bureaus in Washington has a representative authorized to 

 forward such material to this Journal and abstracts of official publications 

 should be transmitted through the representative of the bureau in which they 

 originate. The abstracts should conform in length and general style to those 

 appearing in this issue. 



GEODESY. — Triangulation in Georgia. C. H. Swick. U. S. Coast 

 and Geodetic Survey Special Publication No. 43. Pp. 53, with 9 

 illustrations. 1917. 

 This is one of a series of volumes published by the U. S. Coast and 

 Geodetic Survey which give the data for triangulation stations estab- 

 lished by that bureau. The present volume contains the geographic 

 positions of approximately 590 triangulation stations in the state of 

 Georgia, in the interior and on the coast. It is expected that the de- 

 scriptions of these stations in Georgia will be published by the Coast 

 and Geodetic Survey in the near, future in a second volume. 



In the published form the results of triangulation of the country are 

 made accessible to geographers, surveyors, and engineers for control 

 of maps, surveys, and engineering works of various kinds. The results 

 of this triangulation are also of value to geodesists in the determina- 

 tion of the figure of the earth and in investigations in the subject of 

 isostasy. 



C. H. S. 



ELECTRICITY. — Some electrical properties of silver sulphide. 



George W. Vinal. Bureau of Standard Scientific Paper No. 



310 (Bull. Bur. Stds. 14: 331-339). 1917. 

 Silver sulphide may be prepared in the form of short wires or thin 

 strips like a metal. The wire, which must be drawn hot, was found 

 to conduct electricity like a metal of high specific resistance and ap- 

 proximately zero temperature coefficient. A strip of sulphide rolled 

 at room temperature has a large temperature coefficient and shows 

 both metallic and electrolytic conduction. It has a volt-ampere 



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