The geometrical key: or, The gate of aequations unlockt. [electronic resource] : A new discovery of the constructions of all aequations howsoever affected, not exceeding the 4th degree; viz. of linears, quadratics, cubics, and biquadratics, and the finding of all their roots as well true as negative, without the use of mesolabe, and trisection of angles; without reduction ... / By Thomas Baker, rector of Bishop Nympton.