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Bessemer Bessemer process blade blast Boilers bottom breaking strain bricks carbon cast iron cast steel cause cent centre chaplets clean coke Colonies Id containing core cupola cylinders defray extra Postage diameter dried dry sand edges electrum English stamps Erith facing sand feet filled flange flow-gates Foreign stamps foundry furnace ganister gates green sand heat heavy holes inch thick inches ingot Kingdom on receipt ladle latter liquid loam mould manganese melted metal moulder moulding box open hearth open hearth furnace ordinary oxide P.O. or English pattern pen and pencil pencil points piece pig iron plate produced proper quantity rammed receipt of P.O. round ruling pen runners sand castings sand mould scab scrap sent post free sent to defray silicon slag snugs square Steam surface three inches tons tuyeres United Kingdom vent weight wood wrought iron