IMPROVED DRUG MILL. 
255 
ART,. LV.—ON AN IMPROVED DRUG MILL. 
Invented by Beriah Swift, 
Our attention has been recently called to an improved porta- 
ble mill, designed for the use of druggists and apothecaries in 
grinding drugs for the purposes of decoction, infusion or dis- 
placement. u The superiority of this mill consists in the grind- 
ing surfaces of the plates being cut into circular rows of teeth? 
concentric with the plate, and so arranged that the teeth of one 
plate extend between the rows oftppthof the other plate, by which 
the extent of grinding surface is greatly increased beyond what 
it would otherwise be." The larger teeth have a claw shape? 
which enables them to draw in and crush much larger masses 
than those we have heretofore examined. The hopper is con- 
structed of cast iron, and firmly attached in its place by a screw 
bolt and nut. The chief advantage of this class of mills, and 
this one especially, is that it will readily, with comparatively 
