Smithsonian Report. 1935. — Simon 



Plate i 



The Apparatus. 



^°me^rtd-'lf 'fhP^tnn^fh'^''^ ''?,f''^ containing the liquid hydrogen in which the helium apparatus is im- 

 ^tn n.;f^f f h T^P '^'^^ ^^"^ thermometer, mdicating the temperature of the helium liquefier On the 

 thm part of the Dewar vessel are the coils for measuring the sus^ceptibilitv of the salt in the rfeht bottom 

 fZTJ^'' ™^^*'\^i'll^ ';?° ^'^ ™«^'ed to surround the lower part of the D^war vessel On the lef?^ 

 the balloon mto which the helium is expanded can just be seen "' 



