118 TKANSACTIONS OF THE [MAY 11,. 



May 4th, 1891. 



Eegular Business Meeting. 



Held in the Chemical Lecture Room, School of Mines. 



Twenty-one persons present. 



In the absence of officers Mr. McOarty was elected Chair- 

 man and Dr. Britton Secretary pro tern. 



The minutes of April 6th were read and approved. 



Dr. T. Sterry Hunt and Dr. Simon Newcomb were elected 

 Honorary Members. 



The following paper was read, entitled 



ELECTRIC METERS. 

 BY L. H. LAUDY, PH.D. 



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 George F. Kunz. 



There being no paper for the evening, the meeting adjourned. 



' The autlior 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 also spoke of the compara- 

 tive cost and efficiency of illumination by oil, gas, and electricity. 



