antique whistle research into whistology

what is interesting about escargot toothgrips is that when they appeared on the scene in light weight form in the mid 1880s by Hudson and following the button whistles, they had toothgrips. Buttons never did though.

Of course no 6 piece cast whistles that followed like Wards, McDonalds, Aulds and others used them at all. In fact 5 piece whistle by Black and 'others' didn't use them, nor Barrall.

Then in 1891 the new patented Glasgow, heavier style came out from Hudson and voila – no toothgrip or did they?? . But wait, on again, off again….Yes and no….

But wait, sometimes it was left off even on 1897 models. And then again models in the 30s —

But wait, on page 19 of More Whistles by Gilchrist a picture shows a span of yeeeeeeears with NO toothgrips….on some. What;s the rule then ??? Needed or not ??

I dunno……