Sewage sediment that has been subjected to vigorous aeration and the action of microorganisms.

A flux having a resin or rosin base and containing an additive to increase wetting by the solder.

Charcoal obtained by carbonizing organic material, usually in the absence of air; usually in granular or powdered form; highly effective

A form of aluminum oxide which adsorbs moisture readily and is used as a drying agent.

A glass having a yellow tint which reduces the transmission of infrared and ultraviolet rays; sometimes used in factory windows

A platform above the theater stage floor which is used for acting.

A spotlight used to illuminate a selected acting area.