Last word on books,
Of course one of the most popular subjects of research is Police whistles — and so that is PERFECT that the theme and highlight of CPWs is not only that, but really unlocks the subject of METROPOLITAN police issues from start to present. Now where can you get info like that on the web ???
Original stuff and seems so even today.
It is so much easier to understand this concept of police whistles after understanding the Metros huh ?? Cause then it is only a step away to understand OTHER police whistles.
After that it is so much easier to understand NON police issues.
Eventually one may grow to the point of the second of MG's books on whistles of different shapes and uses.Of course plastic is another subject altogether.
Now should we move on to sirens ????