1909} BRIEFER ARTICLES 303 
though thin steel, and is provided with convenient handles, leveling screws, 
and suitable holes for the two upright rods. The recording cylinder, 
Fic. 2.—Demonstration auxograph. 4. 
Supported and guided at the top by a screw pivot, turns once an hour, and 
is of such circumference that each millimeter of a millimeter record paper 
represents one minute. It is carried by a clock which is supported at such 
