Tough-pitch sentence example

tough-pitch
  • This is effected by stirring the molten metal with a pole of green wood (" poling "); the products which arise from the combustion and distillation of the wood reduce the oxide to metal, and if the operation be properly conducted " tough-pitch " copper, soft, malleable and exhibiting a lustrous silky fracture, is obtained.
    0
    0
  • Figure 2 Typical effect of the extent of previous cold work on the annealing behavior of tough pitch copper Cu-ETP.
    0
    0
  • Often our competitors use very impure ' tough pitch ' copper, which has about 1500 crystals or grains in each foot.
    0
    0