Mechanical Contracting & Plumbing January-December 1908 . a screw, the dies thenbeing started by the pressure of thehand. There is no reversing of the diesto be done in connection with this de-vice, nor screw-apart of pieces after athread has been finished ; neither isthere the wear to contend with thatthere is with a leader screw, such wearbeing second only to that on the cut^ting edges of the dies. The illustrationsgive two views of this leading device,one showing the device itself ; the other COPPER FOR STEAM PIPES. In a recent lecture before the Insti-tute of Marine Engineers of London, J.
Mechanical Contracting & Plumbing January-December 1908 . a screw, the dies thenbeing started by the pressure of thehand. There is no reversing of the diesto be done in connection with this de-vice, nor screw-apart of pieces after athread has been finished ; neither isthere the wear to contend with thatthere is with a leader screw, such wearbeing second only to that on the cut^ting edges of the dies. The illustrationsgive two views of this leading device,one showing the device itself ; the other COPPER FOR STEAM PIPES. In a recent lecture before the Insti-tute of Marine Engineers of London, Milton, chief engineer of Lloyds Re-gister, made an interesting declarationon the use of copper for steam on this point, he said : Copper is valuable for steam pipeschiefly on account of its ductility, itsability to withstand considerable repe-titions of changes of form, and its non-liability to rust. Ordinary copper con-tains a proportion of impurities such asarsenic, bismuth, antimony, lead andother metals, but by electrical deposi-.
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