combining materials into mortar.
In the mortar-mill the sand, lime, and mortar are compounded together by rakes attached to the arms of a revolving wheel that moves round in a circular bed.
In the examples given,—
a is a large loam and mortar mill on the Chilian principle.
b is a mortar-tempering machine turned by handcrank.
c is a mortar-mill on the same truck with the steam-engine which rotates the edge-stones in the bed.
Fig. 3231 shows a mortar-mill on a large scale, occupying several floors of a building.
The lime is slaked in a revolving barrel A, and discharged into a settling-vat.
From this the paste passes to the curing-vat R, and is pumped thence into the upper one of three mixing-cylinders B C D. These revolving cylinders are slightly tapering, and have teeth on their inner surfaces, which mix the materials and gradually forward the mortar to the discharge end. It passes from one