wo chambers are separated by a indicated in Fig. 4, to receive the knot of a cord. One In the ordinary concrete mixers, wet cement is screen, which supports a mass of pebbles and broken of the figures shows how the apparatus is used. The liable to collect on the inside of the mixing drum. stone.… … companying engraving, is provided with a head, on CONCRETE MIXING MACHINE. APPARATUS FOB TBEATING BUBBEB. which the felt strips are adjustable. The head of the hammer is resiliently supported on the shank, so as the cement has the effect of contracting the capacity or ashes from passing upward and…
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