...WILL UNBALANCEThe quality of mortar depends largely on the quality of sand: it is necessary to sift carefully to avoid patches of clay, coarse particles, stones. To facilitate this work will help here’s a simple mechanization. To the sieve, suspended by springs, is attached to the electric motor, the shaft is mounted an eccentric weight: when it spins, it shakes the entire suspension, just have to fill in a pulsating sieve of another portion of sand.

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