J. R. Howell, of Boston, and D. D. Lambert, of New Haven, Conn., have taken measures to secure a patent for an improvement in portable mills, which consists in the employment of an oil fountain bush, so arranged as to hold and retain a constant supply of oil around the collar of the spindle and boxes, the boxes being entirely submerged in the oiL The upper stone is hung upon the spindle in such a manner that the ordinary bail is dis pensed with, and a perfect universal joint obtained. The runner stone is so attached to the spindle aa to move up and down with it.