Knight's American mechanical dictionary : a description of tools, instruments, machines, processes and engineering, history of inventions, general technological vocabulary ; and digest of mechanical appliances in science and the arts . Marble-Rubber. MARBLE-SCOURER. 1:593 MARINE BAROMETER. Fig. MarbU-Satc. the e.\ample (Fig. 3060) the saw is operated by pit-mans and eccentrics. Fig. 3061 is a plan view of a machine in wliichthe saws maj be adjusted to saw a block into pyra-midal fovTns. Guide-blocks, provided with roll-ers over which the belts pass, are secured within ^,.^\^^

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