other methods of driving their burrs. These all give this style a most decided preference over any other method of driving. The cost is about the same as gearing. We can now give parties interested, references to mills of this same kind in most any of the middle and western States. Of course we do not advocate this plan of driving burrs, nor this style of husk for every case. There are a great many places where there is not the necessary basement room, and parties do not wish to go to any more expense than the usual short husk portable mill, and some situations would require a geared mill all rigged and fitted up in the best manner. In the engraving, Fig. 7, is shown one of these husks with two upper and one under runner mill; the frame is not shown as heavy as we use for 42 inch and 4 feet stones; one of the lower belts is shown, the others in dotted lines. The shelving for supporting the belt when the tightening pulley is thrown back is not shown. Our adjustable tightening frame and hinge is of superior advantage in stopping and starting either one or all the burrs. They are operated by hand wheels from above in a very simple and easy manner not shown in the cut. The precise slant and position of this movable pulley is regulated by an improved hinge having but three castings, a wrought iron rod, and three screw bolts, one of them provided with two hexagon nuts to regulate the position in one direction, while the plate to which the frame is hinged allow it to be adjusted in another required direction. By keeping the pulley in the proper position the belt raises from the shelving and touches nothing but the pulleys when in motion. The excellence of this combined mill arrangement, with the new features, is considered of great advantage, and is highly commended by all of those using them. [Illustration] [Illustration: DOUBLE REEL BOLT. Lower part of Elevator and Cooling Conveyor not shown; doors opening to the reels on the opposite side of chest.] DOUBLE REEL BOLT.