122 REPORT— 1894. 



As a unit of electro-motive force, the international volt, which is the 

 electro-motive force that, steadily applied to a conductor whose resistance 

 is one international ohm, will produce a current of one international 

 ampere, and which is represented sufficiently well for practical \ise by 

 t5t5¥ °^ *^® electro-motive force between the poles or electrodes of the 

 voltaic cell known as Clark's cell, at a temperature of 15° C, and 

 prepared in the manner described in the accompanying specification.^ 



As a unit of quantity, the international coulomb, which is the quantity 

 of electricity transferred by a current of one international ampere in one 

 second. 



As a unit of capacity, the international farad, which is the capacity 

 of a condenser charged to a potential of one international volt by one 

 international coulomb of electricity. 



As a unit of work, the joule, which is equal to 10^ units of woi-k 

 in the C.G.S. system, and which is represented sufficiently well for 

 practical use by the energy expended in one second by an international 

 ampere in an international ohm. 



As a unit of power, the ^catt, which is equal to 10" units of power in 

 the C.G.S. system, and which is represented sufficiently well for practical 

 use by the work done at the rate of one joule per second. 



As the unit of induction, the henry, which is the induction in a 

 circuit when the electro-motive force induced in this circuit is one inter- 

 national volt, while the inducing current varies at the rate of one ampere 

 per second. 



The Chamber also voted that it was not wise to adopt or I'ecommend 

 a standard of light at the present time. 



A more complete report of the operations of the Chamber will shortly 

 be forwarded. This brief resum^ of its definite action in reference to the 

 matter of units is now submitted to facilitate the prompt dissemination 

 among representatives of foreign Governments of the important results of 

 a congress of whose success and fruitfulness the United States may justly 

 be proud. 



H. A. Rowland. Elihu Thomson. 



T. C. Mendenhall. E. L. Nichols. 



H. S. Cakhart. 



platinum bowl not less than 10 centinaetres in diameter and from 4 to 5 centimetres 

 in depth. 



The anode should be a plate of pure silver some oO sq. cm. in area and 2 or 3 mm. 

 in thickness. 



This is supported horizontally in the liquid near the top of the solution by a 

 platinum wire passed through holes in the plate at opposite corners. To prevent 

 the disintegrated silver which is formed on the anode from falling on to the 

 kathode, the anode should be wrapped round with pure filter jiaper, secured at the 

 back with sealing-wax. 



The liquid should consist of a neutral solution of pure silver nitrate, containing 

 about 15 parts by weight of the nitrate to 85 parts of water. 



The resistance of the voltameter charges somewhat as the current passes. To 

 prevent these changes having too great an effect on the current, some resistance 

 besides that of the voltameter should be inserted in the circuit. The total metallic 

 resistance of the circuit should not be less than 10 ohms. 



' A committee, consisting of Messrs. Helmholtz, Ayrton, and Carhart, was ap- 

 pointed to prepare specifications for the Clark's cell. Their report has not yet been 

 received. 



