H. A. Rowland—Absolute Unit of Electrical Resistance. 281 
Art. XLIL.—Research on the Absolute Unit of Hlectrical Resist- 
ance; by Henry A. Row.anp,* Professor of Physics in the 
Johns Hopkins University, Baltimore, Md. 
Preliminary Remarks. 
SINCE the classical determination of the absolute unit of elec- 
ment, the induction current was uced by reversing the 
main current, and in Kirchhoff’s by removing the circuits to a 
distance from each ot And ms to me that this 
In the carrying out of the experiment I have partly availed 
f my own instruments and have partly drawn on the 
he experiment was performe : 
house near the University, which was reasonably free trom 
* I am greatly indebted to Mr. Jacques, Fellow of the University, who is - 
excellent Sherrer for his assis uring the experiment, particularly in read 
the nt gal 
