red heat

Water gas is made by placing coke in a vertical cylinder and heating the coke to a red heat.

At red heat, the little molecules can squeeze themselves through the crystalline interstices of quartz and steel.

The art of brazing is applied to metals which will withstand a red heat, and the joints so soldered have the strength of brass.

All these alloys appear to require annealing at a red heat before their resistances are anything like constant.

The precipitate, when well washed, is to be placed in a Hessian crucible, and exposed to a red heat for half an hour.