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.
comparator. 1  any of various instruments for making comparisons, as of lengths or distances, tints of colors, etc. 2  Electronics. a circuit for comparing two signals, as readings of duplicate information stored in a digital computer, and for giving an indication of agreement or disagreement between them.