A New Form of Compass-Clinometer. 



263 



XXIV. A New Form of Compass-Clinometer. 



BY ISRAEL C. RUSSELL. 



Read June 10th. 1878. 



In the accompanying figure, a vertical projection and sec- 

 tion are given of a combination of clinometer and compass, 

 recently constructed by Mr. "William Gruno (the well-known 

 instrument-maker at Columbia College, N". Y. City), after a 

 drawing made by the writer. This instrument is watch-shaped 

 in outline, with a base on which to place it, for the purpose of 

 determining the inclination of surface. The sides are of glass, 

 which enables the observer to look through the instrument in 

 order to measure angles at a distance. The outer rim and base 

 are of brass, cast in one piece, and accurately finished. One 

 of the glass sides is securely fastened in its place, and, through 



