Svr WThoms on 
Fhil. Trans. 1879. Plate 11 
-100° -0’ *100° *200° *300' *H)0' 
goo 
100 
600 
soo 
-100' 0" +100’ +200' *300' +W 
Jidy.MT 
XXI 
Stretched/ by JO U>s. 
-WO O' -WO' -ZOO' *300° 400' 
Harrison & Sons. Lith.. Sr Martins Lane/W. C 1 
