282 KANSAS CITY REVIEW OF SCIENCE, 



in their upper extremity, a track-wheel with a circular groove upon its circumfer- 

 ence and having fixed in a similar manner beneath the wood track a plain-faced 

 roller which is adapted to prevent any tendency of the door toward tipping and 

 raising the other hanger from the track. 



A metal track having a circular or convex head, and a flange, on one side is 

 employed, and it is attached to the wood track by any approved means. 



In operation an inside sliding-door is suspended from a single track, faced 

 by a circular threaded track-plate and attached to the timbers of a building in the 

 usual manner. 



Under-rollers are journaled within the intermediate fork of the hangers and 

 are adapted by contact with the under side of the said track to keep the door in a 

 longitudinally vertical position. 



Lateral movement of the hangers is prevented by means of the annular 

 groove upon the face of the suspending wheels fitting over the convex head of 

 the metal track before mentioned. 



There are openings in the top of the door in which the pendant threaded- 

 end of the hangers are fixed. These are suitably protected by metal plates, and 

 by reason of a rectangular opening in the same, the hangers are prevented from 

 turning therein. 



The door is guided and held in a vertical position by means of a double-roller 

 guide-plate which is adapted to operate within a groove formed in the floor-end 

 of the door, the said guide-rollers are attached to the floor in such a position that 

 the two centres will be in Ime with the said groove, but the line of the centres 

 may form an angle with the line of the groove, as in this manner the guide-rollers 

 can be so adjusted to a groove that is larger than the diameter of a single roller, 

 as to avert any room for loose rattling. 



This rattling is a common defect in the usual method of guiding the lower 

 end of sliding doors. 



The hangers described possess the advantage of being easily applied, as there 

 is no leveling of double tracks, and as the weight of the door is hung directly be- 

 neath the centre of the track, there is no side draft, as is the case when one side 

 of a double track settles with the building. This invention was recently patented 

 by Mr. Henry Fleming, of this city. 



Improved Label-Case for Druggists. — There is provided, a cabinet of 

 suitable capacity and of ornamental construction that is provided with small open- 

 faced compartments in which the labels are placed and held with their upper 

 edges inclined outward, by means of a spring follower. 



The case is constructed of any suitable material, preferably wood, and is 

 formed with a number of horizontal rows of compartments that are composed of 

 a back and a top and bottom beveled at the front edge for guiding the upper 

 edges of the label toward the front opening and a facing block that has a segment 

 of its upper edge cnt away so as to exhibit the labels that are contained in the 

 compartment and pressed against the inclined inner-side of the face-block. 



