West , Newman l Co hit 
Phil. Trans. 1886. Plate/ 16. 
Sheets 1. 
ApproocirruDJte/ Synthesis of ciuirculeristic/ cwv&. 
A Amiscuuxre,. D. DeduxoeFL curve* 
B. Air space*. E. Observed/ results, + ascending, 
C. Magnets. F FroKbLcfa's carve*. 
© descending. 
