I have before me a ventometer of which I know nothing.

The only markings are a name of -W.Gregory & Co London-

It is the one pictured in the bottom right of the picture below--borrowed from Mr wheatfields posting.



So a few questions--
a) anyone have instructions (printed)
b) anyone have instructions on how to use this ventometer from personal experience, how to mount how to use.
c) what will it fit ? A Martini or a Lee Enfield (long lee)?

Regards
Terry in Victoria
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