Glossary C
Combined rotary-percussion is the term used to describe the utilisation of different modes of kinds of drilling. It normally embraces percussion and rotary methods of drilling. (see percussion drilling and rotary drilling).
Coke oven gas is described as the mixture of permanent gases produced by the carbonization of coal in a coke oven at temperatures in excess of 1,000 degrees Celsius.
Cellulose is a complex carbohydrate that is the main constituent of plant cell walls, and is used in the manufacture of paper, rope, textiles, (eg cotton and linen) and plastics (eg Cellophane). A Flake is a small flat particle which has broken away or is breaking away from a larger object. So a cellulose flake is a small particle of cellulose.