object
Sector
A named hinged dual-scale calculating instrument of early modern mathematics and gunnery. Not a slide-rule, not proportional-dividers alone, and not a published gunter-chain.
Also known as Gunter sector · Mathematical sector
object
A named hinged dual-scale calculating instrument of early modern mathematics and gunnery. Not a slide-rule, not proportional-dividers alone, and not a published gunter-chain.
Also known as Gunter sector · Mathematical sector