﻿700 
  Prof. 
  J. 
  de 
  Kowalski 
  and 
  Dr. 
  U. 
  J. 
  Rappel 
  on 
  

  

  Part 
  I. 
  

  

  Method 
  and 
  Apparatus. 
  

  

  The 
  circuit 
  was 
  set 
  up 
  in 
  accordance 
  with 
  the 
  diagram 
  

   presented 
  herewith 
  (fig. 
  1). 
  B 
  represents 
  a 
  storage-battery, 
  

  

  Fig. 
  1. 
  

  

  capable 
  o£ 
  giving 
  from 
  110 
  to 
  130 
  volts. 
  M 
  is 
  a 
  direct 
  

   current 
  motor. 
  Suitable 
  rheostats 
  are 
  inserted 
  in 
  the 
  circuit 
  

   of 
  the 
  armature 
  and 
  fields. 
  Coupled 
  directly 
  with 
  the 
  motor 
  

   is 
  a 
  3' 
  5 
  K.w. 
  monophase 
  generator 
  G, 
  which 
  was 
  specially 
  

   constructed 
  for 
  these 
  measurements 
  by 
  the 
  Oomp. 
  ei. 
  de 
  

   Geneve. 
  Its 
  voltage 
  curve 
  very 
  nearly 
  approaches 
  a 
  sine- 
  

   wave, 
  as 
  is 
  evident 
  from 
  the 
  oscillogram 
  reproduced 
  in 
  

   fig. 
  2. 
  

  

  Fio;. 
  2. 
  

  

  The 
  current 
  from 
  the 
  generator 
  is 
  fed 
  through 
  a 
  rheostat 
  

   to 
  a 
  step-up 
  transformer 
  T, 
  constructed 
  by 
  the 
  firm 
  Brown, 
  

   Boverie 
  & 
  Co., 
  of 
  Baden, 
  Switzerland. 
  The 
  indicated 
  ratio 
  

   of 
  transformation 
  is 
  from 
  70 
  to 
  .50,000 
  volts. 
  

  

  y 
  and 
  A 
  indicate 
  respectively 
  a 
  voltmeter 
  and 
  an 
  ampere- 
  

   meter, 
  which 
  were 
  simply 
  used 
  for 
  orientation 
  purposes, 
  and 
  

   not 
  for 
  the 
  measurements. 
  

  

  