Jor detecting Metallic Masses in the Human Body. 9 
a single one as regards their relative distance; and Mr. F. T. 
Sond, Washington correspondent of the N ew York get: 
uggested w inding two wires side by side into a single co 
that the lke distances of the wires from the bullet tad 
To primary coils of 
~ tnduction pt MSS 
be absolutely the samé. Mr. Ch arles E. Buell and Dr. Chi- 
este e 
bal lancing coils until silence was restored ; the secondary bullet 
Fig. 7, 
it was presumed would then be at the same distance from the 
balancing coils as the embedded bullet from exploring coils. 
The results of all the experiments so far e were neem 
factory. I had tried every thing that had ot suggested, 
#™ remained the extreme limit of audibility for a bullet like 
