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I see these around NYC relatively frequently. Sometimes I generally also see gas canisters apparently slightly open in subways and street corners at the same ti
by yepnopemaybe 11y ago
I see these around NYC relatively frequently. Sometimes I generally also see gas canisters apparently slightly open in subways and street corners at the same time I see the gas detectors.
I have always assumed that whoever is responsible for placing the devices is releasing a benign (but distinct) gas and measuring it in several places downwind.
By doing so, the DHS could use the data they gather to triangulate the source of a chemical weapon, or to predict its most likely path of destruction for quick aid and response.
- deet 11y agoAre you referring to gas canisters other than the liquid nitrogen tanks that litter the sidewalks to cool underground infrastructure?
- MertsA 11y agoI'm not aware of any use of liquid nitrogen to keep general infrastructure cool but it sounds like you're referring to the gas tanks that keep wiring under a positive pressure to keep moisture out. http://gothamist.com/2008/01/31/nitrogen_tanks.php http://gothamist.com/2008/01/31/nitrogen_tanks.php
- deet 11y agoI stand corrected! That use makes more sense, since sometimes they seem to come and go transiently.
- yepnopemaybe 11y agoI haven't looked to closely into it, but some of the canisters I have seen have seemed to be slowly releasing gas into the air.