American Concrete-Mixer

This machine consists of a long box or shoot divided vertically into compartments separated from one another by doors.

The ingredients are placed in the uppermost compartment, and the doors being opened by long levers worked from the top of the shoot, the materials fall gradually from one compartment to the other until they reach the bottom of the shoot thoroughly mixed.

The advantage of this arrangement is that the lower end of the shoot may be placed at the point where the concrete is to be deposited, so that any further handling of the concrete after mixing it is unnecessary.

This machine is not used in England, and therefore no illustration of it is given.