118 TRANSACTIONS OF THE [Ma Y dogs 
May 4th, 1891. 
ReGuLAR Bustness MEETING. 
Held in the Chemical Lecture Room, School of Mines. 
Twenty-one persons present. 
In the absence of officers Mr. McCarry was elected Chair- 
man and Dr. BritTron Secretary pro tem. 
The minutes of April 6th were read and approved. 
Dr. T. SterryY Hunt and Dr. Simon NEwcomB were elected: 
Honorary Members. 
The following paper was read, entitled 
ELECTRIC METERS. 
BG Ts) SEV. eras Yee Ene 
Illustrated by diagrams, apparatus, and experiments.’ 
May 11th, 1891. 
STATED MEETING. 
VicE-PRESIDENT Dr. HUBBARD in the chair. 
Seven persons present. 
The minutes of April 27th were read and approved. 
JosE G. AGuILeRA, Escuela de Mineria, Mexico City, was: 
proposed as Corresponding Member by GzorGE F. Kunz. 
There being no paper for the evening, the meeting adjourned. 
1 The author explained to his audience most of the forms of appara- 
tus used for measuring the electric energy for lighting purposes, com- 
paring their accuracy with gas meters. He alsospoke of the compara- 
tive cost and efficiency of illumination by oil, gas, and electricity. 
