FireChat may catch on as a way to corral revelers, but that's just the beginning of its practical applications. For political organizers, it could become a critically important way to keep protesters and activists connected when their traditional forms of communicating get cut off.
Desiccators are sealable enclosures containing desiccants used for preserving moisture-sensitive items such as cobalt chloride paper for another use. A common use for desiccators is to protect chemicals which are hygroscopic or which react with water from humidity.
actuator - a mechanism that puts something into automatic action. 1  mechanism - device consisting of a piece of machinery; has moving parts that perform some function. 2  positioner, rotary actuator - (computer science) the actuator that moves a read/write head to the proper data track.