Hello. Sorry for my bad English.

I need help. The book "Daggers And Bayonets. A history" by Logan Thompson, I saw "Italian devider" (photo attached).
Could someone tell, what it is, how and why use it?

Thank you in advance.

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That looks to me like a drawing compass or indeed a divider or caliper. It is a technical drawing tool used to draw perfect circles and archs. It can also be used to measure distances. Something an architect or engineer would use or perhaps a navigator.

Kinda cool. It seems it could double as a dagger or even a parrying dagger. But that is hard to tell without knowing the dimensions of the object.

Gunner's stiletto. Many of these are multipurpose tools. They can clear a cannon vent or prick a charge. Etched or engraved measuring marks are common. This one also serves, presumably, as a divider for map work or possibly as a crude caliper for measuring bore.

Yes, for using with a sector/proportional military compass.

Cheers

GC

Ahhh--that's so cool! Does anyone have pictures or links to other examples of this kind of weapon/tool?

often the arms are inscribed with ranges, powder and shot weights and the like.