176 



W. H. WARREN. 



Fig. VI. C. 



Extension on 20 inches in units of "0004 inches. 

 30 15 60 75 90 105 120 



135 



5 j.u 15 20 Zo 3U 35 -1U 45 5u 55 oO t5 70 78 80 85 

 Deflections in units of *004 inches. 



Fie. VI. d. 



