
Although I understand most things about sirens, I do have a few questions:
What does N/H stand for?
Why are some sirens that are older painted black?
Is there an application to find sirens on an iOS device?
Thanks. Here is a list of sirens that I know of in my reigon:
Black Jailbar Thunderbolt (Schenectady)

SD-10 (Niskyuna)
STL-10 (Delanson)
2001-DC (Delanson)
Model 5T/7T (Duanesburg)
Model 5 (Schenectady county)
STH-10 (Princeton, Albany, and Schenectady (2))
Diaphone (Albany)
3T22 (South Glenns Falls VFD)

Sterling M-10? (Rotterdam)