Magnetic Phantoms. 69 
tance above, something is placed sufficiently hot (a cover of a 
crucible for instance) to melt x or fatty substance. 
This last, when made liquid, rises by capillarity between the 
gene of the filings, and if the substance is then removed the 
atty matter solidifies, sticking together all the metallic parti- 
or a long time the magnetic phantom was only an object 
of curiosity. But since the applications of electro-magnetism 
ve become numerous, these phantoms have been found to be 
Very useful. We learn from them, whether the poles of a mag- 
net are, or have been, isonomal or antinomal, isodynamic or 
sterodynamic, with “points consequents” or not, bifurcate, — 
-tnfureate, tubular, circular, etc.* - 
* This Jour., Il, xxx, 413. 
