Carbon Blocks. Carbon in block form. Used to assist in building up parts that are to be added. They may be ground to any shape desired.

Carbon Rods. Carbon in rod form. Employed to save holes around which the metal is melted.

Carbonizing Flame. A flame with an excess of acetylene gas.

Contraction. The shrinkage of metal due to cooling.

Cross-bar. Hand screw for adjusting the passage of gas through the regulator.

Cutting Jet. Central jet of oxygen issuing from tip of cutting torch.

Cutting Torch. A torch with one or more heating jets and an oxygen jet, used for cutting metals in the oxy-acetylene process.

Cylinder. A tank containing gas under pressure.

Ductile. That property which permits metal being formed or drawn into different shapes without breaking.

Expansion. Increase in size due to heating.