Abstract: A process and apparatus for the preparation of mortar from an aggregate and a binder is disclosed which comprises the use of a silo provided with at least one partition so as to create in the silo two or more compartments for the separate storage of the aggregate and the binder, the compartments being provided with conveyor screws, the speeds of which can be adjusted to control the volumetric flow of the components to a mixing chamber. When the desired amounts have been dispensed, the remaining materials may be stored indefinitely for layer use. The silo compartment for the aggregate may be provided with a heating element to safeguard the mechanically operated slide valve against freezing. The conveyor screw in the outlet for the binder may be provided with a cam and a plunger rod with transverse projections to prevent arching in the compartment for the storage of the binder.

Abstract: An attachment formed of a flexible material is provided for use with a hair dryer having an air discharge nozzle, the attachment being expandable in use from a collapsed position to an expanded shape. It comprises an imperforate funnel-shaped wall portion open at both ends, the small end being connectable to the air discharge nozzle. An outer end wall provided with outlet openings extends across the larger end of the funnel-shaped wall portion and is connectable thereto. Flexible strips situated within the funnel-shaped wall portion connect the central portion of the outer end wall to the small end of the funnel-shaped wall portion and serve to maintain the outer end wall in its expanded shape during use.