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not above 16 or 18 per cent. of antimony.An alloy employed for metallic packing contains Pb. 80 ; Sn. 1 2 ; Sb. 8.(7) The copper-lead-antimony alloy should not contain above 10 per cent.copper.One tested alloy of good character is Cu. 10 ; Sb. 25 ; Pb. 65.It has been used successfully on railway axles.(8) The copper-tin-lead alloys are the usual bronzes of anti-friction metal makers.The lead is probably a necessary constituent for highest efficiency.They contain from 75 to 90 per cent.copper; 8 to 12.5 per cent.tin, and 0 to 15 per cent.lead.Fluxing with arsenic or phosphorus is usually adirantageous, the amount found in such alloy averaging about 0.8 per cent.R. H. T.
Livingston Farrand (Fri,) studied this question.