with the Induction Balance. 59 
Although the great object of the researches that have been 
brought before you to-day has been to find that arrangement 
of balance which will detect a bullet at the greatest distance’ 
from the coils of the explorer, it must not be forgotten that in 
every case the instrument is more sensitive to the presence of a 
_ bullet placed inside the exploring coils than to one exterior to- 
them. When, therefore, we seek the location of a bullet in one 
Fig.29. 
of the limbs, it may be advisable to use an annular coil large 
enough to slip easily over the leg or arm, as the case may be. 
n Mr. Tainter’s arrangement 
aia the exploring coil E (fig. 29) might 
simply be a large ring consisting of 
a number of convolutions of thick 
wire which could be slipped over 
- the limb, or the ring might consist 
of two coils, forming one side of a 
Hughes’ induction balance. 
In either case the loudest sound 
will be produced when the bullet 
= <a is in the plane of the ring, and its 
“xact location should be deduced from three observations. 
Uppose, for instance, that with the ring inclined in a particular 
direction the maximum sound is obtained when the ring occu 
