In _annealing_ and _tempering_, electricity has also been employed as a means of heating (see patent to Shaw, No. 211,938, February 4, 1879). Edward W. Byrn.十九世纪发明进展.
The plate is then taken to be Harveyized by cementation, hardening, and tempering, as seen in Figs. 260, 261, and 262. Edward W. Byrn.十九世纪发明进展.
Showing a shaft weighing about 33,000 pounds being taken from the vertical heating furnace and suspended over the oil-tank preparatory to being lowered for tempering. 佚名.神奇的知识之书.
Welding by Electricity, and Tempering and Annealing. 威廉·亨利·杜利特.世纪发明.