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For a better understanding of the invention, reference may be had to the accompanying drawings, in which Figure 1 is a longitudinal sectional view of one form of aerating apparatus employed in practicing the invention;<a href="http://www.robocrushers.com/faq/mobile-crusher-supplier.html">Mobile Crusher Supplier</a>, Figure 2 is a similar view of a modified form of aerating apparatus; and Figure 3 is a diagrammatic illustration of a form of apparatus used for practicing the invention, in which the cement is conveyed pneumatically.

In the practice of the invention by means of the apparatus illustrated in Figure 1, the hot ground cement issuing from the mill is introduced through an inlet 10 into a trough-like container 11, in the lower wall of which are mounted air nozzles 12 supplied with air under pressure by a pipe 13. A shaft 14 is mounted in suitable bearings at the ends of the container to extend lengthwise of the latter and on this shaft are mounted stirring elements 15 <a href="http://www.robocrushers.com/faq/feldspar-milling-plant.html">Feldspar Milling Plant</a>. The shaft is provided outside the container with a coupling 16 by which it may be connected to a source of power. At the end of the container opposite to that provided with the inlet is an outlet 17.

The apparatus illustrated in Figure 2 includes a trough-like container 18 having an inlet 19 and an outlet 20. Within the container above the lower wall thereof is an inner bottom wall 21 formed of porous material having very fine pores.Partitions 22 leading from the lower wall of the container to the inner porous wall subdivide the space between the walls into chambers 23 into each of which air is supplied under pressure by a pipe 24 having branches 25.

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