. The Artizan. ore particularly those which have cores, in getting off thegases generated from the case and mould while the metal is flowing in. What I propose in the casting of guns is that the mould be made in abox or flask in the usual way, only it should be provided with a planedjoint, so as to make it air tight; when bolted together, a tbin strip otindia rubber on the planed face would be sufficient, I should core is supported in the usual way- The top plate, which covers theould (and which, of course, must be made air tight also) is provided witha pipe A and a hole to receive t
. The Artizan. ore particularly those which have cores, in getting off thegases generated from the case and mould while the metal is flowing in. What I propose in the casting of guns is that the mould be made in abox or flask in the usual way, only it should be provided with a planedjoint, so as to make it air tight; when bolted together, a tbin strip otindia rubber on the planed face would be sufficient, I should core is supported in the usual way- The top plate, which covers theould (and which, of course, must be made air tight also) is provided witha pipe A and a hole to receive the end of the core bar. The gate head tohave a fire clay plug B, properly fitted and luted over so as to make it airtight, is connected with a lever for lifting it up. C is a pipe in con-nexion with an air pump. When the pipe on the top of the mould isready for receiving the metal, the cock at D is opened aud a vacuamformed in the mould : this could be ascertained by a vacuum guageplaced on the top of the When all is ready, and the pit on the top charged with metal, tin-valve, or lire clay plug It, is opened and the metal allowed to tlow in. A soon as the mould is tilled and all the gases generated from it have bean pumped oil, a DOld stream ol air ftd doWU the bar by closing the BOek at I), aud by proper arrangement! in connexion withthe air pump, Whether il east under ciree r or otherwise, I do not know. One thing I should think, this Baiting a be sounder and 11 f .or I I am, dtW Sir, faithfully. ,i. A- , -i, \ . |;\,iv, t\ U v ; \ . war l<n« h- in N. ttreon ihe I i sun ntddal polii \ of rt dui than the â i handling the goods, in ordei a ess. â â thieigo, io H:â . 1,000 mil charge) bul LOo. currency for 1 i Phi r in i n York Central is as great, and the Pennsyh ⢠a Central, In ordi to shippers that it will carry goodlrondf. 262 THE ARTIZAN. [NOYEMBEB 1, 1868. NOTES AND NOVELTIES. MISCELLANEOUS. State op Trade in Liverpool.
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Keywords: ., bookcentury1800, bookdecade1840, booksubje, booksubjecttechnology
