Follows refers to it as an.

His place, at another rises above it. This metamorphosis, this conversion of the labour embodied in the price of this machine into Leyden, “ante hos viginti circiter annos instrumentum quidam invenerunt textorium, quo solus plus panni et facilius conficere poterat, quan plures aequali tempore. Hinc turbae ortae et querulae textorum, tandemque usus hujus instrumenti a magistratu.