File:Spons' dictionary of engineering, civil, mechanical, military, and naval; with technical terms in French, German, Italian, and Spanish (1871) (14576541008).jpg

Identifier: sponsdictionaryo05spon (find matches)
Title: Spons' dictionary of engineering, civil, mechanical, military, and naval; with technical terms in French, German, Italian, and Spanish
Year: 1871 (1870s)
Authors: Spon, Edward Byrne, Oliver Spon, Ernest
Subjects: Engineering
Publisher: London, New York : E. & F.N. Spon
Contributing Library: Smithsonian Libraries
Digitizing Sponsor: Smithsonian Libraries

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hen one of the two leversP* is moved, it, by the con-necting rod P^ gives motionto the other lever, andconsequently both theirwheels are simultaneouslyrotated, and the two wheelsin their turn give simul-taneous motion to thescrew-sliafts P, by meansof their respective pinions.It is preferred that theblock or casting L, andthe parts connected withit, should be raised andlowered as required byhydraulic power, but theymay be moved by otherapparatus attached to theeye-bolt S. In the ar-rangements shown, thepouring of the melted steelor iron into the mould isintended to be performedbefore the core is intro-duced into the mould, andthis is desirable where thesides of the hollow castingare comparatively thin, asis the case in castinghexagon shells ; but wherethe sides of the hollowarticle to be cast are ofgreater thickness, and where the pouring of the melted metal may be freely performed after thecore is in its place in the movdd, the core may be introduced into its position before pouring.
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1564 FOUNDING AND CASTING. In using the apparatus, the melted steel is poured into the mould, and the block L is quicklylowered into position ; the screw-clips N N are then to be locked, and the ram Q brought up by itsplunger C, and the melted metal thus subjected to great pressure. When the metal has becomeset, the metal core K is raised, and in rising it will become free from the coating of sand, loam, orrefractory material. The metal core K is lifted by admitting water under pressure to the spaceunder the piston K, which piston is set free by unlocking the screw-clip N^ The core K is raisedup through the part M, which remains in position, so that the metal remains still compressedwithin the mould. In casting steel shells weighing 150 lbs., Whitworth finds the pressure shouldremain on about eight minutes before the core K is withdrawn. The lifting of the metal core Kallows the cavity formed in the hot metal to contract in the latter part of the cooling. The dis-tance between the nut

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