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alloy alternating current angle arranged blast body bottom board bottom box brass foundries Brass moulders brass-melting brick brickwork bronze built calamine brass cast iron centre chamber charge check valve chimney circular cock coke conductor copper core coreboxes crucible curved dowelled draught economy edges electric furnace electrodes fireclay fitted flange flask flat foundry fuel globe valve green sand gun metal heat heavy holes illustrated ingate ingots joint board joint face laid latter liable lift lining loose melting mixing mixture molten metal moulding box necessary odd-side phosphor bronze phosphorus pieces pins pipe plane portion pouring preheater prints proportion quantity rammed recessed refractory ring round runners sand scrap screwed seen in Fig separate shown in Fig side sloping spelter square suitable taper temperature thickness tilting trunnions turned valve venting vertical volatilisation voltage wood wooden pattern zinc