236 ANNUAL REPORT 
the point of construction. The machine consists of the two halves of a 
cylindrical drum, hinged together at one edge and closing by a spring and 
catch at the other. It is mounted upon the axle of a two wheeled vehicle. 
The drum is also so constructed that it can be made to revolve as the 
LOADED 
Fig. 138.—The Dromedary Mixer, Loaded. 
wheels revolve, or it can be thrown out of gear and allowed to swing free. 
In one side is a door, through which the drum is loaded. When loaded, 
(see figure 138) it is thrown in gear and the horse hauls the dromedary 
drum to the point of discharge. The concrete is mixed by being carried 
DUMPING 
Fig. 1389.—The Dromedary Mixer, Dumping. 
up the side of the revolving drum and sliding and falling in thin sheets over 
the mass of material within. In unloading a bar is unlatched which causes 
