﻿Diamagnetic 
  and 
  Weakly 
  Magnetic 
  Substances, 
  

   Table 
  I.— 
  Marble. 
  

  

  443 
  

  

  - 
  

  

  Pi- 
  

  

  Mean 
  

   Px- 
  

  

  Pa- 
  

  

  Po-Px 
  + 
  e- 
  

  

  w. 
  

  

  I. 
  

  

  KXlO 
  6 
  . 
  

  

  Italian 
  j 
  

  

  Italian 
  f 
  

   Statuary 
  (1) 
  

  

  Rutland 
  f 
  

   Statuary 
  \ 
  

  

  Gray 
  f 
  

   Knoxville 
  [ 
  

  

  Italian 
  f 
  

   Statuary 
  (2) 
  \ 
  

  

  103-3462 
  

   103-3463 
  

  

  101-2129 
  

   101-2146 
  

  

  102-7416 
  

   102-7382 
  

  

  103-7836 
  

   103-7832 
  

  

  102-8600 
  

   102-8620 
  

  

  103-3462 
  

   101-2138 
  

   102-7399 
  

   103-7834 
  

   102-8610 
  

  

  103-4244 
  

   1012798 
  

   102-8070 
  

   103-8336 
  

   102 
  9279 
  

  

  •0792 
  

   •0670 
  

   •0681 
  

   •0512 
  

   •0679 
  

  

  518 
  

   5-13 
  

   514 
  

   5-12 
  

   514 
  

  

  •490 
  

   •474 
  

   •502 
  

   •500 
  

   •491 
  

  

  -•940 
  

  

  -•832 
  

   -•795 
  

   -603 
  

   -•811 
  

  

  Pi 
  ■ 
  

  

  74-6630 
  

  

  /V- 
  

  

  73-0726 
  

  

  •0010 
  

   •0027 
  

  

  Pi~Po 
  + 
  S 
  - 
  

   1-593 
  

  

  7=4-54 
  

   1= 
  -427 
  

  

  H. 
  

  

  8,060 
  

  

  Special 
  attention 
  was 
  thus 
  bestowed 
  upon 
  the 
  study 
  of 
  the 
  

   magnetic 
  properties 
  of 
  marble 
  since 
  it 
  has 
  been 
  often 
  used 
  as 
  

   a 
  means 
  of 
  support 
  for 
  coils 
  in 
  standard 
  apparatus. 
  The 
  

   results 
  obtained 
  seem 
  to 
  indicate 
  that 
  almost 
  any 
  variety 
  of 
  

   marble 
  can 
  be 
  relied 
  upon 
  to 
  be 
  diamagnetic 
  and 
  free 
  from 
  

   iron, 
  and 
  to 
  have 
  a 
  magnetic 
  susceptibility 
  of 
  about 
  

   — 
  '8xl0 
  -6 
  . 
  Therefore 
  it 
  would 
  seem 
  that 
  a 
  free 
  use 
  of 
  

   marble 
  in 
  magnetic 
  apparatus 
  is 
  allowable. 
  

  

  Table 
  II. 
  gives 
  the 
  data 
  and 
  results 
  for 
  aluminium, 
  glass, 
  

   and 
  tin. 
  

  

  Table 
  II. 
  

  

  Aluminium 
  

  

  Glass. 
  

  

  Tin 
  

  

  111-5490 
  

   111-5565 
  

  

  92-5120 
  

   92-5120 
  

  

  162-0290 
  

   1620295 
  

  

  Mean 
  

   Pv 
  

  

  111-5527 
  

  

  92-5120 
  

  

  162-0293 
  

  

  Po- 
  

  

  111-3680 
  

  

  92-5524 
  

  

  162-0048 
  

  

  p= 
  

  

  

  

  

  Po-Pl+O- 
  

  

  w. 
  

  

  t. 
  

  

  kxW. 
  

  

  -•1837 
  

  

  4-49 
  

  

  •650 
  

  

  4-1-88 
  

  

  4-0414 
  

  

  3-97 
  

  

  •536 
  

  

  - 
  -578 
  

  

  - 
  -0235 
  

  

  4-52 
  

  

  •436 
  

  

  4- 
  -354 
  

  

  Pi- 
  

  

  745290 
  

  

  Po- 
  

   729274 
  

  

  e= 
  -0010 
  

   £ 
  = 
  •0024 
  

  

  F= 
  

  

  Pi-Po+ 
  s 
  - 
  

   1-604 
  

  

  /=4-54 
  

   1= 
  -427 
  

  

  H. 
  

  

  8,120 
  

  

  