R. Bunsen on the Washing of Precipitates. 325 . 
is placed a perfectly accurately fitting filter made of writing- 
paper; this is kept in position by dropping a little melted seal- 
ing-wax between its upper edge and the glass; the paper is 
next saturated with oil and filled with liquid plaster of Paris, 
and before the mixture solidifies a small wooden handle is 
Whole into the hollow cone and turning it round once or twice 
under a gentle pressure, the proper shape is completed. The 
platinum funnel, which should not allow of the transmission of 
ght through its extreme point, even now possesses such sta- 
bility that it may be immediately employed for any purpose, 
desired, it may be made still stronger by soldering down the 
* The size of this cut has been reduced about one third. The diameter of 
fig. 2, in the original drawing, is 2°5 millimeters.—ps. : 
. 
