Inert fillers

Blind Load and Plugged (B.L. & P.): A projectile may be loaded with sand or other inert material and sealed with a solid base plug, or the tracer hole (fuze hole) in a base plug may be blanked off.

Blind Loaded and Tracer (B.L. & T.): These projectiles have an inert load, but a tra-cer is inserted in the fuze hole of the base plug.

White phosphorus: An unstable smoke-incendiary agent, white phosphorus ignites when exposed to air and produces dense white smoke. It also has its incendiary, anti-personnel effect.

Gas: The various type of gas fillings are listed under the subject of "Chemical Filler Markings" on pages 15 and 16.