APPENDIX. 311 



c 'tween 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." 

 See pages xxxiv and 251. 

 VOLT-AMPERE. Equivalent to Watt. 



WATT. The unit of electrical power = io 7 units of power in the C. G. S. system. It is re- 

 presented sufficiently well for practical use by the work done at the rate of one Joule 

 per second. 



Watts = volts X amperes = amperes 2 X ohms =volts 2 /ohms. 

 For conversion factors see page 227. 

 Watts X seconds = Joules. 



WEBER. A name formerly given to the coulomb. 

 YEAR. See page 108. 



Anomalistic year = 365 days, 6 hours, 13 minutes, 48 seconds. 

 Sidereal ' =365 " 6 9 " 9.314 seconds. 



Ordinary " =365 " 5 " 48 " 46+ 

 Tropical " same as the ordinary year. 



