﻿38 
  Roioland 
  and 
  Pennhnan 
  — 
  Electrical 
  Measurements. 
  

  

  of 
  using 
  open 
  leads 
  and 
  open 
  resistances 
  having 
  little 
  or 
  no 
  

   capacity 
  in 
  all 
  cases 
  in 
  which 
  the 
  coils 
  experimented 
  on 
  and 
  

   the 
  resistance 
  boxes 
  used 
  in 
  their 
  determination 
  have 
  a 
  current 
  

   of 
  any 
  considerable 
  magnitude 
  passing 
  through 
  them. 
  In 
  

   several 
  of 
  the 
  following 
  methods 
  constancy 
  of 
  current 
  was 
  nec- 
  

   essary. 
  This 
  was 
  accomplished 
  by 
  various 
  means 
  that 
  will 
  be 
  

   described 
  in 
  their 
  actual 
  application. 
  

  

  Methods. 
  

  

  The 
  methods 
  that 
  were 
  tried 
  were 
  25, 
  26, 
  9, 
  3, 
  12 
  and 
  6 
  

   described 
  in 
  this 
  Journal, 
  December, 
  1897."^ 
  

  

  C^eWW 
  

  

  Method 
  2o. 
  — 
  Method 
  of 
  equal 
  deflections. 
  Absolute 
  method 
  

   for 
  the 
  determination 
  of 
  self-inductance 
  or 
  capacity 
  in 
  terms 
  of 
  

   electromagnetic 
  units. 
  

  

  *Phil. 
  Mag., 
  January, 
  1898. 
  

  

  