On November L8, 1911, the firing was commenced in the 

 morning and kept up all day. Bullets of different materials 

 were used. 



The data obtained on this and following dales are recorded 

 in tables II. III. and [V. In table II the data obtained between 

 eighl o'clock in the morning and noon, are recorded. At noon 

 some deflections were obtained toward the rrd. It is to be 

 noted that the deflections are toward the black, during the 

 morning and opposite to the directions of the deflections ob- 

 tained in the previous afternoon of the day before and re- 

 corded in table 1. This result shows conclusively that we were 

 not dealing with effects due to inertia. The time between one 

 and three o'cdock was spent in trying to find out the cause of 

 this change in deflections, under what appeared to be un- 

 changeable conditions. 



TABLE II. 



The coil used for determining the data of table 3 was a 



s| 1 of No. 34 double cotton covered wire containing several 



thousand turns. A core of laminated iron was put into the coil, 

 thns forming an open magnetic circuit. In order to close The 

 circuit iron was stacked around the coil connecting the free 

 ends of t he iron. 



The of.jeci of this was to determine the effect of the iron 

 on the deflections. It will be noticed that experiments 11, 12 

 and 13 of table II were with one coil only. The galvanometer 



threw (dear off the scale. Lead bullets Were used ill detelinil! 



aline' the data given in table III. An inspection of this table 

 shows that opening or closing the core changed the effect of 

 the bullet upon the deflection of the galvanometer. It had no 

 effect however upon the throw of the galvanometer caused by 



03 



