b4 A. G. Bell—KEaxploring for an imbedded bullet 
power of making very delicate adjustments of the balancing 
We found it advisable, however, to avoid placing metal over 
the eee area of the coils as had been done in the instru- 
ment show g. 
In the baladieee apparat us shown in fig. 25 (which is the 
most perfect one yet aged Nae 4 the lever to which the upper 
coil is attached is made of ubber 
n fig. 26 is shown the fail: eon eanien form of case yet 
aad for holding the exploring coils. 
Fig.25. 
By invitation of Dr. Frank Hamilton experiments were 
mile at his office in oe York, October 7, Tes the instru- 
ments used being those shown in figs. 22, 23, 2 
As this was the first successful ap lication 3 ‘the Induction 
Balance to the discovery of the situation of a ball in the body 
the position of which was previously grenen I may be par- 
doned for entering somewhat into deta 
I shall quote from the Medical Gazette,* of New York, an 
account of the experiments written by one of the witnesses : 
“The first successful application.—On F riday, woe 7, by invi- 
tation, several medical gentlemen,t+ including the writer, met 
Prof. Bell at the house of Dr. Frank H. Bactwe: 3 in this city, 
for the purpose cs witnessing the practical application of his im- 
proved — 
The . pee subjected to experiment was General Calvin 
E. Pratt, saps of the supreme court of the State of New York, 
* See Medical Gazette, Oct. 15, 1881, pp. 347-3 
+The following are the names of the caodial gentlemen who were present, 
each one of whom verified personally the results declared ae entire satisfac- 
en, of Brooklyn; Elias Marsh. of Se. me I at an Bozeman, 
J. H. Hunter, G. Durant, F. Delafield, L. Damainville, W. M M. Chamberlain, oor: 
he eae Frank H, Hamilton and E. J. Bermingham, of New Yor 
