could be discovered in the sudden com- to give the required corrugations, are arranged one over the other. The motion always occasioned by an alarm plates are first rolled plain, welded up, of fire in a factory is not very clear. and then placed in the.corrugating ma- The spinning room in any… … showing that the material is swaged to prevent undue wearing, that their CORRUGATED BOILER FLUES.-Fig. 1. out slightly thinner to cover the larger heating to a dangerous degree is ex- surface required for the corrugations. tremely rare. It should never 6c- The plate, when corrugated, will be thus…
