Ventometers And Their Use And What For

[terryinvictoria]

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

Information

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[JBS]

See if this helps

Ventometer

[John Sukey (Deceased)]

What will it fit? any of the rifles mentioned plus a Snider.
You could even use it on a P53 rifled musket though that is most likely a bit early.

It doesn't "fit" anything, it's just used as a guide to mark the rifle sight for windage.