A PROPOSED DIP PROTRACTOR 



CHESTER K. WENTWORTH 



University of Chicago 



The device herein described consists of a celluloid chart giving 

 the dip of any plane along a line at any given angle with the strike. 

 Several tables for this purpose have appeared which, for office work, 

 are entirely satisfactory. The protractor has in a certain class of 



FIG I. 



fieldwork, which will be outlined below, a superiority over the 

 tables and has not, so far as I am aware, been before described. 



The protractor consists of a rectangular plate of transparent 

 celluloid ruled and numbered as shown in Fig. i. The circular 

 curves represent each a given angle of dip of the plane, i.e., the 

 maximum angle commonly denoted dip. The intersection of 

 the appropriate curve with the radiating line of direction of the 

 required dip cuts off an ordinate, or distance from the horizontal 



